The glass is half full of water.

杯子里装了一半的水。

This is the glass is half-empty versus the glass half-full perspective.

这就是观点对峙：空了一半的水杯和半杯倒满的水杯。

Optimists always say the glass is half full, not half empty.

乐观主义者总是说,杯子有一半是满的, 而不是说杯子有一半是空的.