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taproot    
n. 主根,直根

主根,直根

taproot
n 1: (botany) main root of a plant growing straight downward
from the stem
2: something that provides an important central source for
growth or development; "the taproot of his resentment";
"genius and insanity spring from the same taproot"

Taproot \Tap"root`\, n. (Bot.)
The root of a plant which penetrates the earth directly
downward to a considerable depth without dividing.
[1913 Webster]



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