Polystream
多氯苯
🗣️ 情景例句
Thank you for calling us.
谢谢你打电话给我们。
A good wife and health is a man's best wealth.
贤妻和健康是男子的至宝。
The geologist needs to know what rocks the drill has reached,
地质学家需要知道钻头已经到达什么样的岩层，