keep hold on的用法和樣例：
例句
- He grasped her hand on an impulse.
他情不自禁地握緊她的手。 - The woman took hold of my hand when she became nervous.
這女人害怕時就握緊我的手。 - By instinct he catches hold of a small tree with his right claw.
他那隻無望的右爪本能地抓住一棵矮樹的枝幹，一下就抓住不放了。 - The boss was ready to pounce on the typist when she made the slightest mistake.
打字員即使出了最微小的差錯，老闆也立即抓住不放。
