船到江心，補漏遲

It's too late to plug the leak once ship is in the middle of the river. (idiom)

variant of 船[chuan2]

boat / vessel / ship / CL:條|条[tiao2],艘[sou1],隻|只[zhi1]

to (a place) / until (a time) / up to / to go / to arrive / (verb complement denoting completion or result of an action)

to reach; to arrive / to leave for; to go to / to (a place); until (a time); up to (a point) / (verb complement indicating arriving at a place or reaching a point) / considerate; thoughtful; thorough

surname Jiang

river / CL:條|条[tiao2],道[dao4]

heart / mind / intention / center / core / CL:顆|颗[ke1],個|个[ge4]

to repair / to patch / to mend / to make up for / to fill (a vacancy) / to supplement

to leak / to divulge / to leave out by mistake / waterclock or hourglass (old)

surname Chi

late / delayed / slow