“你会有一门很棒的课程，但是如果没有用心的老师上这门课的话，”她说，“这节课教会你的不会如你想象中多。”
"You can have a great curriculum but if you don't have teachers dedicated to teaching it well," she says, "it won't work as well as you want it to."
莎朗：也许我会试试。但如果没有用怎么办？
如果没有用户通过身份认证，则返回null。
如果没有用户通过身份认证，则返回null。
如果没有用户通过身份认证，则返回false。
如果没有用身份验证客户机编目数据库，则不需要做任何事情。
No need to do anything if the database is not catalogued with authentication client.
如果没有用户名，passwd命令将会改变root的密码。
Without a username, the passwd command will change the root password.
他不屑提及的是，如果没有用户任何一种商业模式都将一事无成。
What he did not bother to mention is that no business model is any good at all without customers.
因此，如果没有用于特定通知的侦听器，通知就不会被真正地传播。
So if there is no listener for a particular notification, it will not actually be propagated.
如果没有用您喜欢的语言编写的客户端库，您就编写一个作为开源项目。
If there isn't a client library written in your favorite language, create one as an open source project.
当然，如果没有用户交互，这个UI没有任何价值。下面就介绍如何进行用户交互。
Of course, none of this is of any value without user interaction, which is next.
家兔是难以掌控的：家兔通常很害怕被抱起，如果没有用正确的方法，它们会非常害怕并且踢，咬和抓。
Rabbits can be difficult to handle: Rabbits often resist being picked up, and if not handled correctly, they can become afraid and kick, bite, or scratch.
卷轴帘：珠链如果没有用拉紧装置固定在墙上或是地板上，儿童可能会将珠链缠在脖子上，造成窒息的危险。
Roller Blinds: If the tension device is not attached to the wall or floor, young children may pull the bead chain around their neck, posing a risk of strangulation.
如果没有用户阈值策略，就无法知道当前的用户数量是否接近最大数量，以及有多少用户在使用完云服务之后没有退出。
Without a user threshold policy, you do not know if the number of concurrent users is approaching the maximum and how many users have not logged off when they are done with the cloud service.
不过，请确保portlet的背景色与红色具有足够的对比度，并确保如果没有用红色突出显示出错消息，您仍可以分辨出它。
However, make sure that the portlet's background color has enough contrast with red, and make sure that you can still tell that it is an error message if it is not highlighted in red.
如果我没有用刷子给你全身上色，你的生命就不会有任何色彩。
If I hadn't brushed you all over, you would not have any color in your life.
医生称，口罩可以阻挡高达80%的病毒，但如果不勤洗手，戴口罩也没有用。
Some doctors say that masks can stop the virus as much as 80%, but if you don't wash your hands often, it's no use wearing a mask.
他解释说：“如果我不能表达我的想法，那它对任何人都没有用处。”
"My idea is no use to anyone if I can't express it," he explained.
如果它们死了，我就会觉得自己是个坏孩子，不知怎么地，没有用心照顾它们。
If they died, I should feel as if I'd been a bad lad and somehow treated them heartless.
如果都没有用的话，那么直接告诉别人你的感受。
If nothing else works, tell the person exactly what you feel.
但是如果你的确是没有用它做任何事情，它只不过是看不见的，因此，它是-，做的好，第二号的同学。
But if you don't actually do anything with it, — it simply disappears, and, therefore, it's — well done, classmate Number Two.
所以，如果你没有用大脚趾站立(或者不能以其为中心转动脚)，那么就会导致你的身体像陀螺那样倾倒或者强迫你重新再踩点，便会加重疲劳以及颤抖。
Thus, if you don't stand (and rotate) over your big toe, your shoe will either pivot you off like a dreidel spun on its side or force you to reset your foot, increasing fatigue while you dither.
不过如果你的没有用螺栓固定保险箱，我会把保险箱直接带走。
并且，如果已经有人在提过云服务但是没有用XMPP，怎么推动他们来转变呢？
And, if people are already providing cloud services without XMPP, what's the motivation to switch?
如果安全标签没有用于某个组件的值，那么设定该值为空值。
If a security label does not have a value for one of the components, then an empty value is assumed.
如果你没有用正确的方式，锻炼对你来说就是非常困难乏味的了，健康饮食也需要很强的自制力。
If you do it the wrong way, exercise is difficult and boring and too much work. If you do it the wrong way, eating healthy takes too much discipline.
如果您启用了全局安全性，那么没有用户可以访问任何的入站服务。
If you have global security enabled, no users will be able to access any inbound service.
如果谈话对你们没有用的话，那两个人就该分开一段时间了。
If talking gets you nowhere, then it's time to move on have a break.
如果谈话对你们没有用的话，那两个人就该分开一段时间了。
If talking gets you nowhere, then it's time to move on have a break.
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