If required, upgrade the new machine with more RAM and disk space when necessary.
如果需要，可以加大新机器的RAM和磁盘空间。
Stop if necessary and go only when the way is clear.
如有需要，停车，只有当道路安全时才能向前行驶。
Well, if necessary I'll book for something when I'm there.
噢，如果需要的话，我到那儿时自己找吧。
Then when you feel like adding something, ask yourself if it's necessary.
然后，当你想进行补充的时候，先问自己是否有必要。
It is not necessary to experience it with another person; we can know its joy even when we are alone if we get in touch with the source of its power within us.
如果我们和这种存在我们内部能量的源泉相连，我们就不需要和另一个人一起经历它，其实当我们单独一人时，我们的确可以感受到这种愉悦。
When you do this exercise, make changes in the sentence structure when (if) necessary.
做这个练习时，必要时可以改动句子结构。
When you do this exercise, make changes in the sentence structure when (if) necessary.
做这个练习时，必要时可以改动句子结构。
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