对

right / correct / couple / pair / towards / at / for / to face / opposite / to treat (sb a certain way) / to match together / to adjust / to fit / to suit / to answer / to reply / classifier: couple

right; correct / towards; at; for / concerning; regarding / to treat (sb a certain way) / to face / (bound form) opposite; facing; matching / to match together; to adjust / to fit; to suit / to answer; to reply / to add; to pour in (a fluid) / to check; to compare / classifier: couple; pair

(once) again / also / both... and... / and yet / (used for emphasis) anyway

a unit of length / inch / thumb

counterpart / other person involved / opposite side / other side / receiving party

to aim at / to target / to point at / to be directed at / registration / alignment (mechanical engineering)

symmetry / symmetrical

to contrast / to compare / to place side by side for comparison (as parallel texts) / to check

dialogue (in a movie or a play)

answering phrase of duet / to sing antiphonal answer

to join up / to dock / a joint (between components)

(botany) opposite leaf arrangement / paired leaf arrangement

correct diagnosis / to prescribe the right cure for an illness / to suit the medicine to the illness

lit. to prescribe the right medicine for an illness (idiom); fig. to study a problem to find the right way to solve it / to take appropriate steps

lit. to play the lute to a cow (idiom) / fig. offering a treat to an unappreciative audience / to cast pearls before swine / caviar to the general / to preach to deaf ears / to talk over sb's head

to squint / to one's liking

control group

symmetry breaking (physics)

symmetric space (math.)

symmetry (as an aesthetic quality)

axis of symmetry / central axis (in Chinese architecture)

anti-aircraft fire / to shoot at enemy planes

anti-aircraft gun

to focus (a camera)