他每天晚上都会换上拖鞋放松双脚。

He changes into his ___slippers every evening to relax his feet.

小偷蹑手蹑脚地溜进了房间。

The thief ___slipped into the room without a sound.

工程师检查了液压系统中的滑靴。

The engineer checked the ___slipper in the hydraulic system.