Undulators
(undulator 的复数) [电] 波纹印码机
🗣️ 情景例句
These are polite questions.
这些问题都是礼貌的。
Could you tell me where is the first-aid room?
你能不能告诉我急诊室在哪里？
The weather's often cold in North and windy in the East.It's often wet in the West,and sometimes warm in the south.
北部的天气常常寒冷，东部则常常利风。西部常下雨，南部有时则很暖和。