Copper stain test
[化] 铜片试验
🧩 词语组成解析
copper
['kɑpɚ]
n. 铜;铜币;紫铜色;警察;
adj. 铜制的;
vt. 镀铜;
🗣️ 情景例句
Sure, I'll let you take my daughter you, but make sure she is back by 10.
可以，你可以带我女儿出去，但你要保证十点前把她带回来。
We are sure both of us have a brighter future.
我们相信双方都有一个光明的前景。
It was noticed that there were no signs or warnings on the supply lines that ran round the port.
人们这才注意到，铺设在码头周围的供应管道上没有贴标签或告示。