per unit weight的用法和樣例：
例句
- Perhaps a key adaptive advantage of the angiosperm is their ability to construct wood with much less expenditure of energy per unit weight.
也許被子植物適應優勢的秘訣就在於它們有能力形成每單位重量的木材可支付少得多的能。 - Perhaps a key adaptive advantage of the angiosperm is their ability to construct wood with much less expenditure of energy per unit weight.
也許被子植物適應優勢的秘訣就在於它們有能力形成每單位重量的木材可支付少得多的能。
