Analar
高纯度化学试剂
🗣️ 情景例句
That means fresh eggs and fresh milk.
也就是说会有新鲜的鸡蛋和牛奶。
His presence in the room was not noticed.
没有人注意到他在房间里。
Tie a heavy weight at the end of a long piece of string.
把一个重物拴在一根长绳子的一端，