茎不向上生长，根也不向下生长。
The stems weren't growing upward and the roots weren't growing downward.
当光照充足时，植物的茎向上生长，根向下生长。
When the plants had more light, the stems turned up and the roots went down.
直根：垂直向下生长的宿存主根。
Taproot A persistent primary root that grows vertically downward.
钟乳石向下生长，相反石笋则向上生长。
Stalagtites are growing downwards, contrary to stalagmites which are growing upwards.
主根垂直向下生长，以固定树身，并吸取深处的水分。
The taproot grows straight down to anchor the tree and reach for deep water.
大约于此同时，漏斗出现，表现为从间脑向下生长的神经上皮。
At approximately the same time, the infundibulum forms as a down growth of the neuroepithelium from the diencephalon.
垂直向下生长的宿存主根。两年生的植物常具有可以储存养料的肥大直根，如：胡萝卜。
Taproot a persistent primary root that grows vertically downward. Swollen taproots used for food storage are common in many biennial plants, such as carrot (Daucus carota).
它们向上生长也向下生长，用它们须发样的脚趾攥紧泥土，用它们猛烈的牙齿噬咬天空，怒气从不懈怠。
They grow up and they grow down and grab the earth between their hairy toes and bite the sky with violent teeth and never quit their anger.
许多人认为树根是向下生长的，但实际上树的大部分根系是向四周生长的 -它们能穿过厚厚的土向四周伸展，树多高，根就伸多远。
Many people think that roots grow downward, but actually most of roots grow in all direction after they through the heavy earth. How tall the tree and how far the roots extend.
许多人认为树根是向下生长的，但实际上树的大部分根系是向四周生长的 -它们能穿过厚厚的土向四周伸展，树多高，根就伸多远。
Many people think that roots grow downward, but actually most of roots grow in all direction after they through the heavy earth. How tall the tree and how far the roots extend.
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