In a nutshell, the Liskov principle states that it should always be safe to use a subclass in any place where the parent class is expected.
简单地说，利斯科夫原则指出应该始终是安全的在父类别预计的任何地方使用子类。
It's not always safe to pay over the Internet, so you should be careful.
在网上付款并不总是安全的，所以你应该小心。
That's if you want to be really honest with yourself. You could always take the safe, comfortable, seemingly innocent life of Not Yet.
如果你真的想对自己诚实，你可以总过“还没”的安全、舒适并且似乎无知的生活。
I always carry some medicine with me whenever I'm traveling, just to be on the safe side.
旅行时，我总是随身带着药，以防万一。
So although mapping to a more general type is always safe, mapping back to a specialized type can be problematic: the specialized type has more rules, which make the content specialized.
因此虽然映射到更一般化的类型是安全的，但是再映射回专门化类型时可能会出现问题：专门化类型有更多的规则使得内容专门化。
In other words, guys can be safe - and probably sorry; or go for broke and damn the torpedoes - and I mean torpedoes. Why is life always so complicated?
换句话说，男人可以免受影响-也许对不起；或许孤注一掷，说出你的想法-我指的是自己的想法。为什么生活总是这么复杂？
There can be no side effects on immutable objects, and caching a reference to an immutable object is always safe from alias problems.
不可变对象上没有副作用，并且缓存不可变对象的引用总是安全的，不会出现别名问题。
However, an external hard drive or USB thumb drive can always be lost or damaged so you will never have full peace of mind that your data is really safe.
然而，硬盘驱动器或usb，也可能随时丢失或损坏，所以对于你的数据是否安全你永远不会感到踏实放心。
To be safe, wash your hands more often, don't touch anyone else's phone or keyboard and always cough or sneeze into a tissue.
为了安全起见，勤洗手，别碰别人的电话或者键盘，并且咳嗽或者打喷嚏的时候要用卫生纸。
To be safe, wash your hands more often, don't touch anyone else's phone or keyboard and always cough or sneeze into a tissue.
安全起见，要更多地洗手，不要接触任何人的电话或键盘，并且只朝纸巾擤鼻涕、咳嗽。
While there have always been reasons for women to be careful when drinking alcohol, this new research gives them even more cause to be aware and play it safe.
虽然要女性对喝酒要小心的理由是多方面的，但这项新研究就更需要她们小心，以防不测。
Financial services will always be a tug-of-war between two contradictory promises: “Your money is safe with us” and “We will earn you higher returns.”
金融服务永远在两大互相矛盾的承诺之间摇摆。一是“你的钱放在我们那儿很安全”；二是“我们能给你带来更高的回报”。
When you install a new version of a package by typing "make install", most Makefiles won't overwrite your existing configuration files sitting on disk — but it's always better to be safe than sorry.
当您通过键入“makeinstall ”来安装程序包的新版本时，大多数Makefile不会覆盖磁盘上现有的配置文件——但如果从安全方面来考虑的话，则应该庆幸这一点，而不是对此表示遗憾。
Unfortunately, it violates the single-threaded model for the UI: the Android UI toolkit is not thread-safe and must always be manipulated on the UI thread.
但不幸的是，上面的代码违背了UI线程的单线程模式：Android UItoolkit不是线程安全的，所以对UI的操作都应该在主ui线程中进行。
It is not always necessary to initialize such variables, but it is easier and safer to do so until you can be certain it is safe to omit an initializer.
虽然这样做并不总是必需的，但是会更加容易和安全，除非你确定忽略初始化式不会带来风险。
It may tell you that you always wanted to be an actor or writer, but you settled for a sales job because it seemed more safe and secure.
它可能告诉你，你一直想成为一个演员或作家，但现在安于一份销售工作，只因为这样看起来更安全保险。
EXAMPLE: Taking a taxi to the airport can be rather expensive, and taking a gypsy cab is much cheaper, but not necessarily safe or appropriate, so I always take properly licensed cabs.
打的去机场非常贵，打黑车便宜得多，但不一定安全，也不太合适，所以，我总是叫有照经营的出租车。
And "if the natural tendencies of mankind are so bad that it is not safe to permit people to be free, how is it that the tendencies of these organizers are always good?"
如果人类本能的倾向是如此的糟糕，以至允许人民自由是不安全的，那么这些组织者的倾向怎么会始终优秀？
So be safe and always practice your underwater skills under the direct supervision of your coach.
也就是说，要在保证安全的前提下在你的教练的监督下进行训练。
So be safe and always practice your underwater skills under the direct supervision of your coach. & k!
也就是说，要在保证安全的前提下在你的教练的监督下进行训练。
My parents knew that as long as the dog and the horses were with us, we would be safe and always find our way home.
我们的父母知道，只要狗和马与我们在一起，我们就会安全无恙，总能找到家。
The atmosphere must always be a safe and supportive one for writers whose work-in-progress is up for discussion.
气氛必须一直是不引起争议 ，且支持进行中的作品被用以当作讨论对象的作者的。
Yet despite how meticulous travel agents may be, there are always some things people need to look after themselves to ensure a pleasant and safe journey.
不管旅行社是多么细心周到，你仍需要注意一些问题，以确保旅行的安全和愉快。以下几点希望能给您以参考。
To be safe, wash your hands more often, don't touch anyone else's phone or keyboard and always cough or sneeze into a tissue.
为了安全起见，勤洗手，别碰别人的的电话或者键盘，并且咳嗽或者打喷嚏的时候要用卫生纸。
And then I would run to close those last few feet between us - reckless as always - and I would be in his marble arms, finally safe.
然后，我会像平常一样鲁莽地冲上前去，走完我们之间的最后几步，然后落入他大理石般的怀抱。最终，我会平安无恙。
And then I would run to close those last few feet between us - reckless as always - and I would be in his marble arms, finally safe.
然后，我会像平常一样鲁莽地冲上前去，走完我们之间的最后几步，然后落入他大理石般的怀抱。最终，我会平安无恙。
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