pith
[pɪθ]
n.
精力;
（木）髓;
（争论、思想等）核心;
橙子等外皮之下的海绵层;
vt.
杀死;
使瘫痪;
除去…中的髓;
例句:
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the pith of her argument
她论据的核心
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Using a sharp knife, cut away the pith and peel from both fruits.
用一把锋利的刀削去两种水果的外皮和中果皮。
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Both the rubber and the pith ball are negatively charged.
这时,橡胶棒和木髓球两者都带负电荷.
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The very pith and essence of our relationship.
来自B. Mason
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Quarter the peel and cut away any thick white pith.
来自THETIMES
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Remove any stray pith and strain the juice into a separate container.
来自THETIMES