hollow out

挖空, 挖洞, 开凿

例句与用法：

A depression or hollow resembling or suggesting a valley, as the point at which the two slopes of a roof meet.

屋谷与山谷相象或让人想起山谷的凹处或洼处，如屋顶两个斜面相遇的那一点

His protests on human rights sound hollow.

他就人权问题提出的抗议听来很空洞。

This tree looks high and strong but actually its trunk is hollow.

这棵树看起来又高又壮，实际上树干是空的。

词形变化：

副词: hollowly | 形容词比较级: hollower | 形容词最高级: hollowest | 名词: hollowness | 动词过去式: hollowed | 动词过去分词: hollowed | 动词现在分词: hollowing | 动词第三人称单数: hollows |