反复思考

Therefore, the writer pays close attention to the design of the exercises in the teaching practice, makes students realize that the result can't be acquired easily, if the problem needs to be solved, serious-minded thinking about it must be given.

因此，我在教学实践中十分注意练习题的设计，使学生认识到结果不能垂手可得，问题需要认真思考、反复实践才能解决。

Henry David Thoreau, American philosopherJust as one wave following another forms the shoreline, so do our daily actions and thoughts, repeated again and again, form the sum and substance of our lives.

就象海岸线是由一个接一个的波狼永地无休止地相互作用才得以形成一样，日常生活中我们的行动和思考也必须经由一次又一次地反复锤炼，才可能实现量到质飞越，从而使我们的生活得以成型。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。