- 丁(nail; spike)
A nail driven straight down looks like the character for nail or the fourth of the heavenly stems.
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butene or butylene C4H8
Butene is an important chemical feedstock.
butene or butylene C4H8
Butene is an important chemical feedstock.
A nail driven straight down looks like the character for nail or the fourth of the heavenly stems.
A nail driven straight down looks like the character for nail or the fourth of the heavenly stems.
butene or butylene C4H8
butene or butylene C4H8
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