单词：be down
下楼来,生病
be down的用法和样例：
例句
- Visibility was down to 100 metres in the fog.大雾中能见距离已降至100米。
- It is easy to see how even a family which had had as good food as it wished and a few extras could be down to bread and scrape the barrel inside a month if the "demon drink" took hold.即使是一个本来想吃得好些就能吃得好些、尚有盈余可供某些别的开支的家庭，倘若嗜上酒来，则在不到一个月的时间里，就可以穷落下来，以致只能吃面包及必须掏尽家底，不难明白这种现象究竟是怎么回事。
- I'll be down in half a tick/in two ticks.我马上就下来。
- A gentleman should not be down on others whatever happens.一位绅士无论发生什么都不应对人家生气。