PWF U5-U7 Word Spelling

n. ['aɪtəm] 项目，物品，条目 a unit or article, often one that is part of a collection or list

n. [dɪˈvaɪs] 设备，装置 a machine or tool created for a specific purpose

v. [dɪˈveləp] 发展，成长 to grow, advance, or change over time

v. [ɪnˈvent] 动词，发明，创造 to create or discover something new that has never existed before

n. [ˈhelɪkɑptər] 直升机 a type of aircraft with rotors that enable it to lift off vertically and fly in any direction

v./n. [dɪˈzaɪn] 设计，规划 the process of planning and creating something, or the thing that has been created

n. /ˈɛndʒɪn/ 发动机 a machine with moving parts that converts power into motion

n. /ˈdrɔːɪŋ/ 图画，素描 a picture or diagram made with a pen, pencil, or other tool

n. /ˌɛndʒɪˈnɪər/ 工程师 a person who designs, builds, or maintains machines, engines, or structures

v. /floʊt/ 漂浮，浮动 to stay on the surface of a liquid or gas without sinking