交互作用

to intersect; to cross; to exchange; to deliver; to pay; to make friends; to associate; to have sexual intercourse.

Mutually; reciprocally; each other; between one another; in turn; inter-

to do; to make; to write or compose; to act or perform; to pretend; to regard as; to feel (e.g. itchy); worker; workshop

to use; to employ; to apply; to operate; to need; to have to; usefulness; utility; expense; outlay; (literary) hence; therefore