喀嚓

lún jī shēng kā chā kā chā de cóng xià cāng li pá shàng lai xiàng shì cuī mián qǔ

轮机声喀嚓喀嚓地从下舱里爬上来，像是催眠曲。

The engine chugged up from below like a lullaby.

jǐng chá jú zhǎng zhàn le qǐ lai xiàng wǒ men jū gōng yòu kā chā yī shēng lì zhèng

警察局长站了起来，向我们鞠躬，又喀嚓一声立正。

The chief of police rose to his feet, bowed to us, and then clicked his heels together with such vigour.