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The key to the exercises presented below is to maintain good form and don't look sloppy stretching.

下面的练习的关键是保持良好的姿势，拉伸不要看起来草率。

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Maintain good form.

保持很好的姿势。

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And,these are occurring at a time when the global economic crisis is making it more difficult to maintain good health, especially in the developing world.

VOA: standard.2009.05.18

Now when you want to maintain good health, high peaks, high spikes in blood glucose and the insulin response that provokes is not a very good thing, and so the red line is a far healthier way to be than the yellow line is.

如果你想保持健康,血糖和胰岛素都出现高峰值,这对健康来说可不是好事,红线要比黄线更健康

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

The similes work not to sew everything up but make it impossible for us to maintain anything like the official position on a moral distinction between heavenly good and satanic evil.

这些比喻不是为了简单的拼凑，而是让我们不能,维持住任何天堂之善与撒旦之恶之间的,清晰的官方界限。

耶鲁公开课 - 弥尔顿课程节选

But at the same time, we still have to maintain good order and discipline.

NPR: Checking In on Fort Carson, Part II

It was constructed from silicon carbide to maintain good shape while being as light as possible.

BBC: Uranus image celebrates Herschel - the man and the machine

Europeans deliberately looked the other way, conscious of the need to maintain good trade relations with China.

ECONOMIST: Europe in the world