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Retroviruses, for example, can only insert - can only transduce and express their DNA in cells that are dividing.
就以逆转录病毒为例,它们只能在分裂阶段的细胞里,转导并表达自己的基因
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This is great when you want to express regret for something that you perhaps did not do.
当你想表达对一些过去没做成的事情感到后悔时，你可以使用这个句型。
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Remember that you can use it to express a need for you to do or have something,
记住，你可以用它来表达你做某事或得到某些东西的需求，
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And the doctor told me it is good for me to express my creative urges.
医生也告诉我,表达出我自己强烈的愿望对我有好处。
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When you express regret for something that you should have, should not have done.
当你想表达某种悔意，对某事你本该做，或本不该做，
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for when you want to express that you are scared of something or someone,
当你想表达你对某事或某人很恐惧的时候，你就可以使用这个句型。
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But rather to express sympathy for what somebody else is going through.
而是对其他人的经历表示同情。
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We want not only for the cell to be able to synthesize the DNA, you want it to be able to express the protein off the DNA as well.
我们不仅希望细胞能复制DNA,还希望它能表达目标DNA所编码的蛋白
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Another situation where you can use "I wish" is when you express regret, a desire to stay longer, for example.
另一种使用“I wish”的情况是当你表达遗憾的时候，例如，希望多待一段时间。
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Of course the most common use of the "I want to" pattern is when you express your desire for something.
当然，“I want to”句型最常见的用法是用来表达你对某事的愿望。
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Here are a few laws that express the idea that the experience of slavery and liberation should be the wellspring for moral action. It should be the impetus for moral action. Exodus 22:20: "You shall not wrong a stranger or oppress him, for you were strangers in the land of Egypt."
这里有几条法律可以说明奴隶制和解放的历史经历,应该是道德行为的源泉，它应该是,道德行为的动力，《出埃及记》第22章21节提到，“不可亏负,寄居的，也不可欺压他，因为你们在埃及地也作过寄居的“
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or, to express the need for somebody else to either do something or have something.
也可以表达其他人做某事的必要或对某物的需求。
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In the next example you can use "I'm sorry" not to express regret for your personal fault.
下一个例句中，“I'm sorry”的使用并不是用来表达对个人过失的抱歉。
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We can use the "I need" pattern to express your need for something, of course,
我们可以用“I need”句型来表达我们对某些东西的需求，当然，
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