两面一样的料子

cloth that is the same on both sides

两面凸的玻璃

glass that is convex on both sides

两面凹的玻璃

glass that is concave on both sides

两面讨好

suck up to both sides

两面政策

policy with two aspects

两面手法

double dealing

耍两面手法

try double dealing

两面受敌

be attacked on both sides