1. it is due to the earth is circular 4 M5 W5 e* t! G W9 [
2. It doesn’t matter whether two numbers adding by what kind of order
$ d3 L, m: m$ s3. It is close to what we have observed& W W5 K3 ~/ d4 k) ?' T- j
4. the actual direction is opposite to we imagined3 @, S7 {' W0 U4 K! B7 F; X# t" I
5. there are some divergence in boundary line between two countries for a long-standing
( h) a3 H# }+ }8 D6. 坏的开始造成了坏的结果
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