1. Billy: Then let´s drop the topic.
    比利:那么我们不谈这个话题.

2. The topic preoccupied me all week.
    整整一个星期我心中老是想着这个问题。

3. And wild questions on the topic of cloning continue to mount.
    关于克隆的问题不断涌现。

4. If she were alive today she would not be able to air her views on her favourite topic of conversation: domestic servants.
    如果她活到今天，她将不能就她热衷的话题"佣人"发表意见了。