A: I would love to sail around the world alone.
B: You must be insane.
insane a. 1. 蠢极的，荒唐的；2. （患）精神病的，精神失常的，疯狂的
A: Can you read the inscription in the book to me?
B: Sorry, I don’t have my glasses and the lettering it too small.
inscription n. 铭文，碑文，题字
A: You are looking tired.
B: Yes, I am suffering from insomnia.
insomnia n. 失眠（症）
A: You are an inspiration to me.
B: You are quite amazing also!
inspiration n. 1. 灵感；2. 鼓舞人心的人（或事物）
A: Did you buy your car with cash?
B: No, I arranged that I will pay in monthly installments.
installment n. 1. 分期付款，分期交付；2. （分期连载的）部分
A: That medicine worked great.
B: Yes, it had instantaneous results.
instantaneous a. 瞬间的，即刻的
A: What are the words to that song you were humming?
B: Oh, it was just an instrumental piece.
instrumental a. 1. (in) 起作用的，有帮助的；2. 用乐器演奏的
A: My house is freezing in the winter.
B: Perhaps you need to insulate it better.
insulate vt. 1. 使绝缘，使隔热，使隔音；2. 隔离，使隔绝（以免受到影响）
A: Did the parcel arrive intact?
B: Yes, there was no damage to it at all.
intact a. 完整无缺的，未经触动的，未受损伤的
A: What is the annual intake of students into your school each year?
B: Oh, about 100 pupils join each year.
intake n. 1. 吸入，纳入；2. 进气口，入口
A: You played an integral part in the project, thanks for your help.
B: You are welcome, but I do not think that my assistance was that important.
integral a. 构成整体所必需的，基本的
A: I admire your integrity.
B: Thanks, I think it is essential to stick to your principles.
integrity n. 1. 正直，诚实，诚恳；2. 完整，完全，完善
A: My intellect is the most important aspect of my mind.
A: And you certainly use your well.
intellect n. 1. 智力，理解力；2. 才智非凡的人
A: Mark always holds intelligible conversation.
B: Yes, he is very smart.
intelligible a. 可理解的，明白易懂的，清楚的
A: We could intensify the light in the room by painting the walls white.
B: Or we could just add more lights.
intensify v. （使）增强，（使）加剧
A: I did not commit the crime with intent.
B: But that will be impossible to prove in court.
intent n. 意图，意向，目的
a. 1. (on)专心的，转注的；2. (on)急切的
to all intents (and purposes) 几乎在一切方面，实际上