Tetrastyrene
四聚苯乙烯
??? 情景例句
Richard, did you go to the Davis Aerobics class today? Richard
你去上Davis有氧運動健身課了嗎？
Straws show which way the wind blows.
草動示風向。
What are the selling points of your product?
你們的銷售重點是什么呢？