waste of time

基本解释

Attempting to change someone is a waste of time and energy.
嘗試改變別人是一件浪費時間和精力的事情。
At the same time, other students in the same class already have the skill down cold, so further practice for them is a waste of time.
同時，同一個班級的其他學生可能已經熟練掌握了這項技能，所以繼續練習對他們來說衹是浪費時間。
blog.sina.com.cn
An architectural description, like any deliverable, needs to be created for a purpose and an audience, otherwise creating it is a waste of time.
一個架搆描述，如同任何可交付的産品，是需要爲了某個目標和受衆而創建的，否則衹是浪費時間。

In addition,news agencies provide updates and companies share product information through Twitter Some critics say Twitter is a waste of time that takes people's attention away from their work.
It was a complete waste of time, unless the goal in life was simply to pester the user for some input.
剛才的時間就完全浪費了，除非那個唯一的目的,是簡單地糾纏用戶索要一些輸入。
哈彿公開課 - 計算機科學課程節選
The last one that we saw was a complete waste of time.
我們看的上一部這種電影完全是浪費時間。
There is no 實戰 - SpeakingMax英語口語達人

This process might take hours or even days, and it is a complete waste of time!
FORBES: Stop Worrying About The Questions -Media Training