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
Did you sleep soundly last night.
你昨晚睡得好吗？
Labour is the capital of our working men.
劳动力是劳动人民的资本。
He's very well, thank you.
他很好，谢谢您。