to become connected to something

The antibodies work by latching onto proteins on the surfaces of the viruses and bacteria. 抗体通过与病毒和细菌表面的蛋白质结合而发挥作用。

to become interested in an idea, story, or activity, and to start to use it

Unfortunately the press have already latched onto the story. 遗憾的是报纸已经盯上这件事了。

to stay close to someone or spend a lot of time with someone, usually when they do not want you near

She latched onto me as soon as she arrived, and I had to spend the rest of the evening talking to her. 她一来就缠住我，我只好晚上一直陪着她聊天。