goodat后面加什么?

　　Journalists are good at sniffing out a scandal.

　　記者善于發現丑聞。

　　He's not very good at getting his ideas across.

　　他不太善于清楚地表達自己的思想。

　　She's not very good at putting her views across.

　　她不大善于表達自己的觀點。