Para.11 Each year since,the concentration has crept upward and it now stands at 0.0340 percent. 必 creep v.move or advance slowly and quietly 慢地行进，潜行 必 e.g.The traffic was creeping along at a snail's pace. 必 I crept up the stairs,trying not to wake my parents. (2)Meaning:Since 1958,every year the gathering of carbon dioxide has increased and now it was about 0.0340 percent.Para.11 ❖ Each year since, the concentration has crept upward and it now stands at 0.0340 percent. ❖ creep v. move or advance slowly and quietly 缓 慢地行进，潜行 ❖ e.g. The traffic was creeping along at a snail’s pace. ❖ I crept up the stairs, trying not to wake my parents. ❖ (2) Meaning: Since 1958, every year the gathering of carbon dioxide has increased and now it was about 0.0340 percent