1、保持你的书桌干净
... Look At Your Desk 看着你书桌 keep your desk clean 保持你的书桌干净 escaping from your desk 脱离桌面 ...
2、保持你的桌面整洁
...No spitting 不要随地吐痰Keep your desk clean 保持你的桌面整洁Be Quiet 安静 ...
3、保持你的课桌干净
...keep to the right 靠右keep your desk clean 保持你的课桌干净talk quietly 小声讲话 ...