tubes in the tree's truck carry water from the roots down to the leaves.为什么句子中的down是错误的?

tubes in the tree's truck carry water from the roots down to the leaves.为什么句子中的down是错误的?
tubes in the tree's truck carry water from the roots down to the leaves.
为什么句子中的down是错误的?

tubes in the tree's truck carry water from the roots down to the leaves.为什么句子中的down是错误的?
from the roots up to the leaves
整句翻译：树干中的导管将根部的水运送到叶片上.
根是在下面的,树叶在顶端,所以应该用up而不是down

这句的意思是说“水沿着树干从树根向上输送到叶子”，所以正确的是up to the leaves。