已知等式x4=x+14+b1x+13+b2x+12+b3x+1+b4,则b1,b2,b3,b4的值分别为( )
Using body language in a correct way will help __________ people and make the stay in a foreign country easy and comfortable.
在太阳光下我们能看到鲜艳的黄色的花是因为( )
76+18-55= ____。