Etalon
[计] 标准, 规格, 校准器, 标准样件, 波长测定仪
🗣️ 情景例句
I see. Then you don't have any collateral.
我明白了。那么你们没有任何担保物。
We can't stop it.
我们不能阻止它。
It is the one world in the Solar System that is most like the Earth.
火星是太阳系里与地球最接近的一颗行星。