Straighten both legs until they are fully extended.

使双腿挺直，直到他们完全伸展开。

《柯林斯英汉双解大词典》

Hospitals were already fully extended because of the epidemic.

这场流行病已使各医院以最大负荷运转。

《牛津词典》

The horse was fully extended.

那匹马已被全力驱策。

youdao

Check out the pictures of the sliding house at night and fully extended (below).

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But Brodeur, with agility that belied his 40 years, recovered in time and blocked with his fully extended left arm.

WSJ: NHL Playoffs: New York Rangers Top New Jersey Devils With Rope-A-Dope Act

It is the picture that confirms Japan's Ikaros solar sail is fully extended and ready for the next part of its mission.

BBC: Mini-camera pictures Japan's Ikaros solar sail