问题描述：
请帮我看看这里down的用法,词性.
新概念第三册的15课有这样一句话:
On his way to the sweet shop,he dropped his fifty pence and it bounced along the pavement and then disappeared down a drain.
请问这里的down是什么词性?为什么这样用呢?或者能帮我找几个例子吗?是在是费解啊.
新概念第三册的15课有这样一句话:
On his way to the sweet shop,he dropped his fifty pence and it bounced along the pavement and then disappeared down a drain.
请问这里的down是什么词性?为什么这样用呢?或者能帮我找几个例子吗?是在是费解啊.
问题解答：
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