The stem helps hold the roots up.

茎帮助支撑根。

youdao

You get a redistribution and mixing of soil as deep roots are ripped up from the ground.

当深根被从地上拔起时，你会得到土壤的重新分配和混合。

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Auxin, for instance, stimulates the rate of cell elongation, causes shoots to grow up and roots to grow down, and inhibits the growth of lateral shoots.

例如，生长素刺激细胞延伸的速度，促使芽和根生长，而抑制侧枝的生长。

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And American soccer is developing "from the roots up."

VOA: special.2010.06.02

An old ivy vine, going bad at the roots, climbed half way up the wall.

VOA: special.2009.08.01

Extra care is needed not to break up the twisted, strange-looking roots;

VOA: special.2009.04.07

The small-"l" libertarians in the tea party movement identified the Republican Party as the coalition closest to their concerns about fiscal responsibility and the growth of government power, and they have gone about making the GOP more libertarian from the grass-roots up.

WSJ: Randy Barnett: The Mistake That Is the Libertarian Party

But Lastoe said he thought his Brooklyn roots might make up for that.

WSJ: Hopes for a Second NYC Marathon

You get your grass-roots movement fired up to stand up and do something.

CNN: Time for Obama to go 'gangsta' on GOP