快速記憶：

grand極重要的+father祖先=grandfather

vt. 不受新規(guī)定限制例句：

Darwin was the grandfather of the theory of evolution.

My grandfather used to drink a cup of green tea before he went to bed.

我的祖父過去常常在睡覺前喝一杯綠茶。

I love chatting with my grandfather on Sunday morning.