Polysulfuration
聚硫化作用
🗣️ 情景例句
He's quiet now.
他现在很安静。
I'm afraid he will lose your money.
我怕他会浪费你的金钱。
Around the year 1600 the first horses were brought to the American continent by the Spanish.
大约在1600年的时候，西班牙人把第一批马匹带来美洲大陆。