但她很固执，不想要剖腹产，因为这会使副作用加倍，康复时间也会延长。
But she was adamant that shedidn't want one of each, thus doubling her side effects and recovery time.
时日所剩无多，监管者必须加倍努力来让测试发挥作用。
With just days to go regulators must redouble their efforts to make the tests work.
若弹簧长度加倍，拉长刚才的两倍，当我把两个弹簧串联，任何一个弹簧，在这个力的作用下，将会拉长相同的量。
If I make the spring twice as long, I would get double the extension, because when I have two springs in series, each one, under the influence of this force, will get longer by this amount.
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