Then I noticed a tail fin missing and I realized what was happening.
当我看到一片尾翼飞了出去我才意识到眼前发生了什么。
Add a propeller and a tail fin and it looks exactly like a little plane.
装上螺旋桨和尾翼之后，看起来极像小飞机。
A tail fin, for example, has many different types of cells and is a very intricate structure.
一个尾鳍，例如有许多不同类型的细胞，是一个很复杂的结构。
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