The responsibility naturally fell on our shoulders.

　　責任自然地落到了我們肩上。

　　Naturally, the tobacco industry is violently opposed.

　　自然地，煙草行業會強烈反對。

　　Naturally, I get upset when things go wrong.

　　事情出了錯，我當然就會很煩。

　　After a while, we naturally started talking about the children.

　　過了一會兒，我們自然而然地談起了孩子。