他一把没抓牢，让那孩子跑掉了。

The child slipped from his grasp and ran off.

《牛津词典》

她设法抓牢光滑的岩石。

She tried to get a purchase on the slippery rock.

《牛津词典》

每一块乐高积木都必须有完美的抓力，既要足够牢固可以抓牢另一块积木，又要足够容易，让孩子们可以把它拉开。

Each Lego brick must have that perfect grasp, strong enough to hold onto another brick but easy enough for a child to pull apart.

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The political scientist he says must have a grasp of the best regime given the most favorable circumstances.

首先，政治科学家,必需要抓牢最佳政体,营造出最合意的情势；

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