Etalon
[计] 标准, 规格, 校准器, 标准样件, 波长测定仪
🗣️ 情景例句
Many advertisements exaggerate the usefulness of the products.
很多广告都夸大了产品的效用。
I learned history last month.
我上个月学历史。
How much more?
还要多下多少？