A lot of teachers spend weeks playing catch up in the fall to make up for the summer drop.

很多老师在秋季学期花几个星期的时间补上暑假落下的功课。

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It's important to tighten up the wheels properly, otherwise they vibrate loose and fall off.

把车轮拧紧很重要，否则它们会振动而松脱。

《柯林斯英汉双解大词典》

If it is displayed on such occasions, do not allow the flag to fall to the ground, but let it be carried high up in the air to form a feature of the ceremony.

如果在这种场合展示国旗，不要让国旗掉到地上，而是让它高高地悬在空中以构成仪式的特色。

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The study found that the patients' risk of suffering a fall was higher for up to one hour after emotional stress.

VOA: special.2009.03.24

The first step to insight is to ask questions like why do things fall down and not up?

起初的洞察力是问问题,为什么物体坠地而不是上升？

耶鲁公开课 - 心理学导论课程节选

So in a moment you're going to go ahead and hit the spacebar and then as things fall from the screen when they line up with the left arrow, hit the left arrow with a different arrow, hit that arrow and see how good a score you can get.

一会儿你走到前面，敲一下空格键,当屏幕上面的东西从左边往下掉的时候,你就敲一下键盘上的左键,是哪个方向，敲对应的方向键就可以了,我们来看看你能得多少分。

哈佛公开课 - 计算机科学课程节选

Since the Welsh Government imposed a 5p charge last year (giving the cash to charity) there's been fall of up to 96% in single use bags in supermarkets.

BBC: Harrabin's Notes: Pay on plastic

According to aid agency Oxfam, when a family member becomes infected, food production can fall by up to 60%, as women are not only expected to be carers, but also provide much of the agricultural labour.

BBC: NEWS | Africa | Africa's hunger - a systemic crisis

Invervention by the central bank kept the currency, the tenge, remarkably stable before the election, but analysts now think it is likely fall by up to 20%.

ECONOMIST: Kazakhstan