Retractometer
收缩仪
🗣️ 情景例句
Don't open the door if you don't know who it is.
如果有陌生人敲门不要开门。
Judy is so reserved that it is hard to understand her.
朱迪非常内向而木讷，因而很难使人了解她。
It extends to a depth of 3,723 feet.
深达3，723英尺。