但是这些投入究竟是如何精确地转化为测试成绩却是一个谜。如果不知道需要去撬起哪个杠杆，那么是很难设计出一个有效的激励计划的。
But how precisely these inputs are converted into a test score is a mystery, and without knowing which lever to pull, it is difficult to design an effective incentive scheme.
我不知道你能否一直全身心地投入到爱情之中。
I don't know if you can be wholeheartedly in love all the time.
即使一切进展顺利，我们也从不知道高铁收入是否足够补偿它在建设和运营上的令人咋舌的投入。
Even if all went well, it was never clear whether the high-speed services would generate enough income to cover cover the staggering costs of construction and operations.
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