to become a member; to join; to mix into; to participate in; to add in

to sink into; to get caught up in; to land in (a predicament)

to throw into; to put into; to throw oneself into; to participate in; to invest in; absorbed; engrossed

to take in; income; revenue; CL:筆|笔[bi3],個|个[ge4]

to penetrate deeply; thorough