香港閱讀城 - The Young Scientists Level 3- 202 An Aerial Runway Called Flying Fox
The Young Scientists Level 3- 202 An Aerial Runway Called Flying Fox
出版日期：
10/2020
叢書：
The Young Scientists
A pulley is a simple machine that is used to lift heavy objects. It is sometimes called a block and tackle. Pulleys are usually used in sets designed to make the amount of force needed to lift something that is heavy.
版面：
固定
插圖：
許多
關鍵字詞：
STEM
|
Science
|
English
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