negative direction的用法和樣例：
例句
- Peeling in the other direction is awkward.
如果逆向刨就會很難。 - I hit the switch, and the chimaera reversed direction instantly.
我一打開電場，銀鮫馬上逆向而游。 - 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.
交流電是指電流先流向一個方向，然後反方向流動。
