第505章 Lesson 49 The Moon and Tides
- 跟美国学生同步练阅读：Smart Reading（英文原版 Grade 1-8）
- (加)韦恩·埃弗里特
- 608字
- 2017-12-29 12:36:18
In order to understand ocean tides, we first need to travel nearly 400000 kilometres into space! Tha...
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In order to understand ocean tides, we first need to travel nearly 400000 kilometres into space! Tha...