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2015

发布于 2024-04-02 · 图片1

people build simple machine because with the simple machine ,doing work is easier. in this book, i learned many simple machines, such as wedge, lever ,ramp ,wheel, axle, screw, and pulley.

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glad贝尔

8岁

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this book tells all about polar bears and their environment, there much less ice than before so they can’t hunt their food, and then they’ll die, and the polar bears species will be extinct .so,let’s make the earth change!

let's-read-and-find-out science 2: simple machines

作者:d.j. ward, mike lowery (illustrations)

出版社:harpercollins

出版时间:2015-10

glad贝尔

2015

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