careful的副词形式为什么要有两个l

carefully adv. 小心地；

carelessly adv. 粗心地；不注意地；无忧无虑地；

例句

He carefully inspected his hand.

他仔细检查手中的牌。

They are carelessly written or drawn.

它们写得或画得都很随便。

He carefully modulated his voice.

他仔细地调节了自己的声音。

She put the glass down carefully.

她小心翼翼地放下玻璃杯。

I listened carefully to her story.

我认真听了她说的情况。

\"Oh,\" he said carelessly. \"I\'m in no hurry to get back.\"

\"哦，\"他漫不经心地说道，\"我不急着回去。\"

The prosecution alleges (that) she was driving carelessly.

控方指控她粗心驾驶。