草莓和奶油——完美的组合。

Strawberries and cream - a perfect ___combination.

疲劳和无聊的结合让我睡着了。

A ___combination of tiredness and boredom caused me to fall asleep.

这种药物可以安全地与其他药物联合使用。

This drug can be safely used in ___combination with other medicines.