Practice with how much pressure needs to be put on the razor or if the thumb should hold hair against the razor's edge are each part of experimenting with this type of thinning out of hair.

这种方法需要反复练习，来摸准把头发按向刀刃的大拇指需要用多大力。

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Old rules of thumb which said that countries should keep enough reserves to cover only short-term foreign debt now look hopelessly out of date.

过去粗浅的经验——国家应该维持足够的外汇储备来应付仅仅是短期的外债——现在看来绝望又过时。

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What this rule of thumb tries to accomplish is to give a downstream component the opportunity to time out on a request before a component further up the call stack does.

这条经验规则的目标是为下游组件提供在调用堆栈的上游组件超时之前超时的机会。

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Hoover Shoates got his head out of the way but not his thumb.

胡福-硕茨只来得及把他的头缩回去，却没来得及把拇指抽回。

耶鲁公开课 - 1945年后的美国小说课程节选

Garland received a cut of the thumb, was afterwards made an out-patient of the infirmary, but the wound mortified, produced lock-jaw, and death ensued.

ECONOMIST: Assize intelligence

So she picked up a bag the size of her thumb, emptied out the beans from within, and began to snap.

NEWYORKER: A Tiny Feast

In Mr Yeltsin's time, attempts to bring under control the far-eastern Maritime Territory foundered when the local armed forces turned out to be under the thumb of the fearsomely idiosyncratic provincial governor.

ECONOMIST: The chaos at the door