音质不算出色，但对于日常使用来说足够了。

The sound quality isn't great, but it's ___adequate for everyday use.

为残疾人提供的通道设施勉强够用。

Provisions for handicapped access are barely ___adequate.

在我看来，动物只应被饲养在能提供足够生活条件和充足空间的动物园里。

In my opinion, animals should only be kept in a zoo that provides ___adequate living conditions and sufficient room.