- 健全: sound; sane; perfect
- 的: 4次方是 The fourth power of 2 i ...
- 视力: vision; sight; visus; seeing ...
- 健全的: ablebodied; as clear as a bell; healthy; sound; sturdy; wholesome
- 不健全的: diseased; distempered; lacking; morbid; noxious; rotten; sorry; strabismic; u ound; undound; unfit; unsound
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