gum classes fell from 42 percent to 29 percent during the 90s.翻译为中文,

gum classes fell from 42 percent to 29 percent during the 90s.翻译为中文, his classes were so ____(bore)that almost every student fell asleep in his classes gum是什么 “bubble gum gum color gum是什么意思 classes fell fell GUM是可数名词吗口香糖-GUM gum怎么读 gum的复数是什么 gum英语怎么读 chewing gum怎么读 bubble gum的音标 laxative gum 是什么 chewing gum量词是什么? Chewing gumChewing gum