A grasp is a very firm hold or grip.
His hand was taken in a warm, firm grasp.
他的手被热情地、紧紧地握住了。
If you say that something is in someone's grasp, you disapprove of the fact that they possess or control it. If something slips from your grasp, you lose it or lose control of it.
The people in your grasp are not guests, they are hostages.
在你控制之下的这些人并非宾客,而是人质。
She allowed victory to slip from her grasp.
她听任胜利从手中溜走。
A grasp of something is an understanding of it.
They have a good grasp of foreign languages.
他们精通各种外语。
within someone's grasp
If you say that something is within someone's grasp, you mean that it is very likely that they will achieve it.
Peace is now within our grasp.
现在和平在望。
grasps , grasping , grasped
If you grasp something, you take it in your hand and hold it very firmly.
He grasped both my hands.
他紧紧地抓住我的双手。
If you grasp something that is complicated or difficult to understand, you understand it.
The government has not yet grasped the seriousness of the crisis.
政府还没有意识到这场危机的严重性。