新的后空翻使空间站的宇航员可以拍摄航天飞机的腹部，超长的机械臂使宇航员可以看到航天飞机以前看不见的部分。
A new back flip maneuver allowed station astronauts to photograph the shuttle's underbelly, and an extra-long robotic arm enabled astronauts see parts of the shuttle that were previously out of sight.
基因遗传自父母，是细胞中微小到看不见的部分。
Genes are tiny, invisible parts of a cell that a person inherits from his or her parents.
在地面上看不见的图案可能是空中照片中最为醒目的部分。
Patterns that are invisible on the ground can be the most striking part of an aerial photograph.
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