perk up

昂首翘尾, 振作起来

例句与用法：

He looked depressed but perked up when his friends arrived.

他看上去无精打彩的，但朋友一来就精神起来了。

The horse perked up its head when I shouted.

我吆喝时那马扬起了头。

词形变化：

动词过去式: perked | 动词过去分词: perked | 动词现在分词: perking | 动词第三人称单数: perks |

详细释义：

活跃起来; 振作起来

After a few minutes, the students perked up and began a heated discussion.

过了几分钟, 学生们活跃起来, 开始了热烈的讨论。