收敛

HSK 7-9

shōuliǎn

to converge; to moderate; to restrain

to exercise restraint; to curb (one's mirth, arrogance etc); to astringe; (math.) to converge

收敛到一个点

shōuliǎn dào yī gè diǎn

converge to a point

他的笑容逐渐收敛

tā de xiáolóng jǐncuò shōuliǎn

his smile gradually converged