If you just start a new type of activity - driving or flying a plane, or anything that requires a lot of learning - you may use this expression as you start to get better at it.
如果你刚刚开始一项新的活动-开车或者开飞机，或者其他需要学习的事情-如果你开始比较不错了，就可以用到这个短语。
When these characteristics are considered and assume that the interface of sea water and sediment is a plane, the expression of reflection coefficient is derived.
考虑到这些特征，再假设海水与沉积物的界面是平的，导出了平面声波在其上的反射系数的表达式。
It makes a close combination of arithmetic and geometric operations, forming a new way of expression of plane figures.
把算术运算和几何运算紧密结合起来，形成新颖的平面图形表达方法。
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