The little telescopes are amazing: if I stretch my arm out in front of me, the telescopes focus on one-quarter of one of my fingernails.

微型显微镜太厉害了：如果我在身前伸展胳膊，显微镜会聚焦到我一片手指甲上的一小块。

youdao

"O my father, " said Rabadash. "How if I show you a way by which you can stretch out your arm to take Narnia and yet draw it back unharmed if the attempt prove unfortunate?

“我的父亲啊，”拉巴达什说道，“我给你想个办法怎么样?凭着这办法，你可以伸出手去攫取纳尼亚，万一不顺利，还可以不受伤害地把手缩回来。”

youdao

When you bend or stretch your arm, it seems that something is drawing it in or pushing it out.

当你弯曲或伸展手臂时，犹如有某东西在拉入或推出。

youdao

To that mythical America, the Promised Land, he would stretch out his bronzed arm and lead his kind.

ECONOMIST: Charlton Heston

Wigan made up for it on 53 minutes when their star man Tomkins stole in for a superb solo try, resisting the challenges of three men and snaking out an arm to stretch his side three scores clear again.

BBC: St Helens 10-22 Wigan