Uld
abbr. 超声探漏器（Ultrasonic Leak Detector）；超低剂量（ultra-low-dose）
🗣️ 情景例句
Studying is a big boring, but it sure beats the unemployment queues.
学习是有点枯燥，但比起失业来好多了。
So many countries, so many customs.
一个国家有一个国家的风俗。
The other students in the class keep their eyes closed.
班里其余学生一直闭着眼。