1. indispensable to 对……来说是必不可少的
Mongolian Milk Tea is indispensable to the daily life of Mongolian herdsmen.
奶茶是蒙古族牧民日常生活中不可缺少的饮料Bk#@~jlC3lU.^7!uw2gW。

2. take someone under one's wing 庇护
I know mum’s always taking you under her wing, but I wouldn’t give in again this time.
我知道妈妈总是庇护你，可这次我不会再让你了OrR_,Sz0VvL|euWyQ。

3. seal of approval 批准；认可；通过
The bill has the President's seal of approval.
法案已经得到了总统的批准B_)AY|i9skp6。

4. selling point 卖点
The house's big selling point is its location.
这套房子的卖点是它的地理位置+wM&ullE|R7_&AOk8#V.。