The basic ways to keep fit are useful, we should take a notice of them. There are other ways, and they are in the base of healthy diet.
保持健康的基本方法很有用,我们因该注意。保持健康还有其他的方法,但都是建立在健康饮食的前提上。
An arctic tern, on its 20,000 km flight from the extreme south of South America to the Arctic circle, will take no notice of a nice smelly herring offered from a bird-watcher's boat along the way.
北极燕鸥在从南美洲的最南端飞往北极圈的路线全长2万公里,但燕鸥这一路上都不会留意观鸟船送来的散发臭味却又可口的鲱鱼。
Try not to get engaged thinking the thought but take a step back and notice what you were thinking of and how you feel.
尽量不要去思考这种想法,而是退后一步注意你的想法和你是怎么想的。
take the derivative of this, get the velocity vector and you notice his magnitude is a constant Whichever way you do it, you can then rewrite this as v square over r.
对这个式子求一次导,就能得到速度矢量,你会发现其模长是常数,不管用什么方法,加速度也可以写成 v^2 / r
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