Polystream
多氯苯
🗣️ 情景例句
How much do you want for this?
这件东西你想卖多少钱？
Food is necessary to maintain life.
食物是维持生命所必需的。
I left a suitcase on the train to London the other day.
几天前我把一只手提箱忘在开往伦敦的火车上了。