如果你对引起紧张和压力的情况和问题还感到无助，这种情况就更具有伤害性。

Stress is more likely to be harmful if you feel helpless to deal with the problem or situation that causes the stress.

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法规还明确了在这种情况下，如果满足一定的文件要求，服务接受方可以进行进项抵扣，因而增值税就不成为一个实际成本。

The rules also make clear that the recipient in these circumstances will be entitled to an input VAT credit, so that VAT is not a real cost, provided certain documentation requirements are met.

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There's no reason why these two attributes had to be proportional, but they are proportional and they are equal by choice of units and you can ask, "Is this just an accident or is it part of a big picture?"

我们不知道这两个质量为何成比例,但它们确实成比例,而且如果选择合适的单位还会相等,你会问,"这种情况纯属偶然,还是这只是物理学大体系的冰山一角"

耶鲁公开课 - 基础物理课程节选