avail,有益，有用，-able,形容词后缀。引申词义可获得的，有空的等。

1. They have only a vague idea of the amount of water available.

他们只是大概知道可用水的总量。

2. Other amenities, less commonly available, include a library and exercise room.

还有一些不太常有的设施，包括图书馆和健身房。

3. Cheap goods are available, but not in sufficient quantities to satisfy demand.

有一些廉价的商品，但是数量不足以满足需求。

4. The service covers contraceptive advice and health checks, and is available free.

服务项目包括避孕建议和健康检查，并且免费提供。

5. Water and electric hook-ups are available and facilities are good.

水和电都可以接通，设施也很不错。