我们用表达 “sink one’s teeth into something（用力地啃咬某物）” 来表示 “全身心地投入或全神贯注于一项活动”。它也可以被用来描述某人积极的工作热情。这个表达也可以用作 “get one’s teeth into something”，意思不变。

例句
My son seemed really bored – so I gave him a video game he could really sink his teeth into.
我儿子当时看起来很无聊，所以我给了他一部能让他埋头专心玩的电子游戏。

She’s really sunk her teeth into this project. She's almost obsessed with getting it done!
她为这个项目投入了很大的精力。她一心想要完成它！

My students really got their teeth into this project-based learning activity.
我的学生们真的全身心地投入了这种专题导向的学习活动。