negative direction的用法和样例：
例句
- Peeling in the other direction is awkward.
如果逆向刨就会很难。 - I hit the switch, and the chimaera reversed direction instantly.
我一打开电场，银鲛马上逆向而游。 - I'm afraid you're going in the opposite direction.
我恐怕你走反方向了。 - By AC it is meant that the current is flowing first in one direction and then back again.
交流电是指电流先流向一个方向，然后反方向流动。
