想抓住

• catch at
• grasp at

例句

1. 他想抓住树枝，可是没够著。
   He clutched at the branch but couldn't reach it.
2. 他想抓住那男孩儿，然而那孩子还是跌倒了。
   He grabbed at the boy, but could not save him from falling.
3. 他白费力气想抓住停在花上的蝴蝶。
   He tried in vain to catch the butterfly on the flower.