Hardmeter
硬度计
🗣️ 情景例句
Please come and see me in my office on the 20th floor.
请到二十楼我的办公室来见我。
What's your favorite food?
你最喜欢的食物是什么？
Portable boiling elements that can boil small quantities of water are useful when the right voltage of electricity is available.
如果有相配的电压，可以煮少量水的便携式热水装置是有用的。