keyboard

to key in; to input; to enter (some text)

keycap

(slang) to discuss politics online

(engineering) keyway; key slot

crucial point; crux; CL:個|个[ge4]; key; crucial; pivotal

button or key (on a device); keystroke; CL:個|个[ge4]; to press a button

triple bond (chemistry); triple link

valence bond (chemistry)

single bond (chemistry)