1. Wear two hats 一肩两职，身兼多职
I am wearing two hats as a cashier here and an accountant, because the regular cashier is pregant.
因为出纳怀孕了，我不得不身兼两职，既当出纳又当会计。
释义：直译是一个人同时戴两顶帽子，引申为一个人同时担任两个职务。
链接：
身兼多职：
wear more than one hat
wear another hat
2. Wet blanket 扫兴的人/事
Don't have Tom go to the party - he's such a wet blanket and he'll spoil the fun.
别让汤姆参加晚会，他总是令人扫兴。
释义：本义是湿毽子。试想一下人们热情似火，情绪高涨，有人却往上面盖湿毽子，能不扫兴吗？
