He lost his balance and fell to the ground.

他失去平衡摔倒在地上。

《牛津词典》

The question we should ask is whether we need balance or just to be able to stand on solid ground?

我们应该问的问题是我们是否真的需要平衡，还是只需要站在生活中站稳脚跟？

youdao

Most of them have glovelike pouches for each toe, so wearers can spread their toes for balance and connection to the ground.

大多数瑜伽袜子都像手套一样分趾，这样穿着的人可以分开脚趾抓着地面，保持平衡。

youdao

Girls with cheeks smeared with thanaka (sun block made from ground tree bark) balance two to a bicycle.

BBC: A new dawn in Burma

However, in order for this process to be successful, it has to take into consideration the actual realities on the ground, not the immediate balance of power in Iraq.

NPR: Scoring the War in Iraq: Who's Winning?

The protester either was knocked off balance or fell to the ground on his own.

WSJ: Bloomberg's Bum Rush Backfires