These lessons are very important; they're how we grow, and how we keepfrom making that same mistake again.
这些教训非常重要，因为它们是我们成长的方式，也是我们避免再次犯同样错误的方式。
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They must also keep swimming to keepfrom sinking, since most have largely or completely lost the swim bladder, the gas-filled sac that helps most other fish remain buoyant.