B: Yes, it tends to grow at a rapid rate. 　　ivy 　　n. 常春藤 　　J 　　A: I need to change the wheel of my car, I have a flat. 　　B: I’ll help, do you have a jack ? 　　jack 　　n. 千斤顶 　　vt. 1.用千斤顶顶起;2。停止，放弃;3。提高，增加 　　A: What type of stone is your ring? 　　B: It is jade , quite rare. 　　jade 　　n. 1。玉，翡翠;2。浅绿(色) 　　A: Did you understand the article I gave you? 　　B: No, there was too much jargon and terms that I had not seen before. 　　jargon 　　n. 术语，行话 　　A: I’m going to rent a jeep for the weekend and drive to the mountains. 　　B: Great idea, can I come? 　　jeep 　　n. 吉普车 　　A: No, I’m not going to cheat on the exam. 　　B: Good, there is no point in jeopardising your degree. 　　jeopardise 　　vt. 危机，损害 　　A: You nearly hit Andrew on the head. 　　B: Good thing that he jerked just in time to miss it. 　　jerk