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.
自行车不是被挂在了树枝上，而是被固定在了树上，树还是会继续向上生长。
The bike is not hanging on a branch—it is fixed in the tree and the tree has continued growing upwards.
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