"折返"是个多义词，它可以指折返,折返（APP软件）。
The latter module which employs a fold-back structure current limit circuit reduces the power consumption when the load resistance is too low.
限流保护电路采用折返式限流电路,在限流的同时降低了功耗。
参考来源 - 低压差线性稳压器芯片的研制·2,447,543篇论文数据，部分数据来源于NoteExpress
他失败了两次，最高的一次走了300英尺后折返。
He'd failed twice, once getting with 300 feet of the top before turning back.
开始的时候跑2 - 3次折返，每周增加一次，直到你能跑8次折返。
Start with two or three incline repeats and add one more each week until you can run eight.
增加幅度看来还不算大，但确实增加了，这便折返了2010年的下跌趋势。
That may not seem like much of an increase, but it reverses the downward trend of 2010.
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