adj.不需要的;没必要的;
例句:
You should avoid unnecessary worry.
你应该避免不必要的担忧.
Unnecessary effort will be reduced as much as possible because we will have increased market intelligence.
不必要的努力会尽可能地减少,因为我们的市场情报将会增加.
All this fuss is totally unnecessary .
这场纷扰是完全可以避免的。