Some believe it's risky to alter Earth's orbit, while others fear the jump will make the Gregorian calendar obsolete because of the length of Earth's new orbit.
有些人认为改变地球轨道太危险，其他一些人则担心由于这一跳会使地球轨道变长，所以要改写公历。
2
The flea can jump 350 times its body length. It’s like a human jumping the length of a football field.
跳蚤可以跳出它身长350倍的距离那么远。
3
The man had measured the lengthof their arms; checked with calipers the thickness of the skin below their eyebrows; had them execute the standing broad jump and a complex version of hopscotch.