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So can the movement of aphids when, having depleted the young leaves on one food plant, their offspring then fly onward to a different host plant, with no one aphid ever returning to where it started.

蚜虫的运动也是如此，当吃完一株食用植物的幼叶，它们的后代会飞到另一株宿主植物上，没有蚜虫会再回到最初的地方。

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Caterpillars eat the young leaves of this plant.

毛毛虫吃这种植物的嫩叶。

《牛津词典》

The leaves make good salads when the plants are young, and the greens can be cooked when the plants are older.

VOA: special.2010.03.02

Some gardeners use leaf mulch fine particles of leaves instead of wood mulch around trees, especially young trees.

VOA: special.2009.06.30

Youth unemployment is especially high, and joblessness among the young leaves lasting scars.

ECONOMIST: Angst in the United States

They discovered that in as many as 62% of them, young leaves tend to be coloured anything from pale pink to deep red.

ECONOMIST: Young leaves, as well as old ones, are often coloured red

But in fact, young red leaves are equally common throughout a forest's layers.

ECONOMIST: Young leaves, as well as old ones, are often coloured red