Empty alternatives are not allowed (these are almost always a mistake), but if you really want an empty alternative use (? :) as a placeholder, for example.
空的选择是不允许的(这通常都是错误)，但如果你真的需要一个空的选择，可以使用(？：)作为占位符，例如。
If one adopts the particle-model as usual, there is always a mistake in the wave source determining method, while wave source, medium and observer move relatively.
当波源、介质、观测者相对运动时，我们习惯采用的粒子模型对波源的测定方法存在错误。
She took photos with her new smart phone and always shared her photos in her friend circle to express how happy she was. As a result, she often did something by mistake.
她用她的新智能手机拍照，并经常在她的朋友圈分享她的照片，以表达她的快乐。因此，她经常会做一些错误的事情。
It's easy to cut yourself off from a vital pipeline if you always eat lunch alone, a common rookie mistake.
如果你总是独自吃午餐的话，很容易切断你的重要的传播途径，而这时一个常见的新任经理犯的错误。
If you try to hide a mistake and someone else finds out (and they always do), the trouble will be much worse because you tried to hide it.
如果你想把错误隐藏起来，被别人发现后麻烦更大(人们总是能发现)，因为你试图掩盖错误。
Even if you make a mistake and forget to reapply or misapply a change, there's always a complete history of all changes (including the ones you overwrote) to refer to.
即便是您出了错，忘记重新应用更改或是错误地应用了更改，总是可以找到所有更改的完整历史(包括您覆盖的那些更改)供您参考。
This is considered by nearly all users as a feature rather than a bug: a negative 32-bit argument or a huge 64-bit argument is essentially always a programming mistake.
这几乎被所有用户作为一个特性而不是一个bug：一个负的32位参数或者一个巨大的64位参数本质上总是一个编程错误。
Making them too stringent (a mistake I tend to make; I always have to double-check myself).
设计的模式过于严格(我常犯这样的错误，不得不仔细检查)。
It goes like this. We always knew that unbridled free markets were a mistake, yet we were derided for saying this; and now we are all paying the price for your excesses.
大致是这样的：我们一直都知道自由放任市场是个错误，然而我们对其视而不见，现在我们所有人都在为这种宽容付出代价。
Doing so would almost always be a serious mistake, however, because even when their return values are used in this way, list-related functions still modify their original argument.
但是这样做通常是一个严重的错误，因为即使它们返回的值以这种方式使用，与列表相关的函数仍然修改它们的原始参数。
I always tried not to have my career be too much of a burden to my children, but looking back, I think that was a mistake.
我一直努力不使我的工作成为孩子们的负担，但是现在想起来，我觉得那是个错误。
Banks such as Bear Stearns and Lehman made the fatal mistake of assuming that the markets (often their fellow Banks) would always be willing to roll over their debts, but they suffered a bank run.
像贝尔斯登和雷曼这样的投行，他们犯了致命错误，他们想象市场(他们的会员银行也经常这样想)总是会咸鱼翻身还清这些债务，最终遭受银行的挤兑。
No, I don’t think Free is always the answer, but I do think thestudios are about to make a mistake of RIAA proportions.
我也不认为免费总是正确的.但是我确实觉得那些工作室对于RIAA的分成模式有误解.
This is almost always a fatal mistake, because new versions that don't include these basic requirements can cause discomfort to both existing customers and new customers.
这种想法大错特错，因为新版本若未包括这些基本的要求就会为现有客户和新客户带来极大的不便。
Do not always think you are reasonable. When you forgive others, you are liberating yourself. No one will carry others 'mistake all his life except a fool.
不要总是觉得自己有理，原谅他人就是解放自己，傻瓜才会把他人的不是，一辈子背起。
Don't always look for someone else's fault, when there is a mistake, we must first realize their mistakes.
不要总是找别人的错，有错时，首先要认识到自己的错。
My first reaction was that it was a joke or a rumor, because there was always the news about celebrity's death which turned out to be a mistake.
我的第一反应就是这是一个玩笑或者一个谣言，因为总有一些消息传出名人的死亡，而后被证实是误会。
At the beginning I always worried about making a mistake during an introduction, offending someone, or making a bad first impression in general.
刚开始时，我老是担心我在做自我介绍时说错话，冒犯了别人或是给对方留下不好印象。
Likewise, when he does something wrong we will ALWAYS let him know he has made a mistake.
同样的，如果它做错了，我也会让它明白它犯错误了。
They are very strict with me, but when I make a mistake, they always listen to me first and help me to find out reasons.
他们对我很严格，但是当我犯错误的时候，他们首先是倾听，然后帮我找出犯错的原因。
There are some scholars on the study of sport language in China always insist to think that sport language used in daily life is a mistake on the point of formal logic.
关于体育语言问题的研究，在中国体育界始终有这样一些学者，他们站在“形式逻辑”的立场上坚持认为：我们现实生活中所使用的体育语言是一种错误。
He said: "It's always difficult for a keeper when you make a mistake and the goal changed the game."
他说：“因为你犯的错而令比赛的比分改写，这对于门将来说简直难以接受。”
Always watch where you are going. Otherwise, you may step on a piece of the Forest that was left out by mistake.
经常注意一下你要去往的方向，否则，你会踏入一片因错误而迷失的森林。
"I always tell my players that if they let a goal in the very top corner we must compliment our opponents. If it doesn't, then we've made a mistake," said the Coach.
“我经常告诉我的球员如果我们的对手进了一个难度很高的进球，那么我们应该去赞扬他们，如果不是，那么我们就犯了错误，”主教练说。
He was not doing a single mistake the whole lap, so Parabolica was always the same distance.
一整圈他都没有犯一点错误，所以出了Parabolica我们之间总是同样的距离。
We know that his play is always fair, just and patient. But also we know, to our cost, that he never overlooks a mistake, or makes the smallest allowance for ignorance.
我们曾付出过代价，所以我们知道我们的对手从不放过我们的丝毫过错，对我们的疏漏不作点滴宽容。
They call me Lily sometimes, and I don't always tell them that they've made a mistake.
他们有时候把我叫成莉莉，可我并不总是向他们解释他们弄错了。
I've just taken a new job. I earn a lot of money but it's difficult work. I'm always afraid of making a mistake.
我刚找了个新工作，可以赚很多钱，但是工作太难了，我总是担心会出错。
I've just taken a new job. I earn a lot of money but it's difficult work. I'm always afraid of making a mistake.
我刚找了个新工作，可以赚很多钱，但是工作太难了，我总是担心会出错。
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