a losing battle
US /ə ˈluːzɪŋ ˈbætəl/
UK /ə ˈluːzɪŋ ˈbætəl/

1.
注定失败的战斗, 徒劳的努力
a struggle or effort that is certain to fail
:
•
Trying to convince him is a losing battle; he never changes his mind.
试图说服他是一场注定失败的战斗;他从不改变主意。
•
Fighting against the new policy felt like a losing battle.
与新政策作斗争感觉像是一场注定失败的战斗。