Changing from hunting and gathering to agriculture had no immediate advantages.
从狩猎和采集转向农耕并没有立竿见影的好处。
Even within a single field, conditions are always changing from one section to the next.
即便在同一个区域内,不同部分的情况也总是在变化。
"The dialogue is changing from what is technologically possible to what is technologically meaningful," said economist Shawn DuBravac.
“这种对话正在从技术可行型向技术有意义型方向转变。”经济学家肖恩·杜布拉瓦克说。
He said the mission in Iraq is changing from a military effort led by troops to a civilian effort led by diplomats.
VOA: special.2010.08.07
So delta u is just equal to the work but we also know what happens T2 because the temperature is changing from T1 to T2.
所以Δu等于输出的功,但我们也知道它会发生,同时我们知道温度从T1变到。
It comes from the fact that velocity is a vector and you can change your velocity vector by changing your direction.
其原理就是,速度是矢量,你可以通过改变方向来改变速度
应用推荐