latch on
phrasal verblatch on (to something) | latch onto something 
- (informal) to understand an idea or what somebody is saying理解,懂得,领会(想法或某人的话) - It was a difficult concept to grasp, but I soon latched on.那是个难以弄明白的概念,但我很快就理解了。 
- He latched on to the truth.他明白了真相。 
 
- It was a difficult concept to grasp, but I soon latched on.
latch on (to somebody/something) | latch onto somebody/something  (informal)
- to become attached to somebody/something变得依附于 - antibodies that latch onto germs依附于细菌的抗体 
 
- antibodies that latch onto germs
- to join somebody and stay in their company, especially when they would prefer you not to be with them纠缠,缠住(某人) 
- to develop a strong interest in something对…产生浓厚的兴趣 - She always latches on to the latest craze.她总是对最新时尚有浓厚的兴趣。 
 
- She always latches on to the latest craze.