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.
在地球上,重力有助于植物的茎“向上”生长,根“向下”生长。
On Earth, gravity helps a plant's stems and roots to find "up" and "down".
Let's look at 2py, which is vertical.
我们看看2py,垂直向上的那根。
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