Elkonit
艾尔柯尼特合金
🗣️ 情景例句
He is still unable to express himself in English.
他仍然不能用英语表达自己的意思。
An empty sack cannot stand upright.
空麻袋，立不直。
Mr. Smith knew Jack didn't look at the others because he was nervous.
史密斯先生知道杰克不敢看别人是因为紧张。