在这种天气下，你不想进行任何不必要的汽车旅行。

You don't want to make any ___unnecessary car journeys in this weather.

目的是尽可能快地杀死动物，而不造成不必要的痛苦。

The aim is to kill the animal as quickly as possible without causing ___unnecessary suffering.

不要在不必要的电视节目或电脑游戏上浪费太多时间。

Don't waste too much time with ___unnecessary TV shows or computer games.