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exchange of visits

as summer comes and winter goes

He is an absolute social climber.

Water naturally flows downward.

fly from Beijing to Xi'an

turn to the left; turn left

look forward

all directing their efforts towards the same goal

go/move upward/downward/forward/backward

dodge swiftly to one side; jump out of the way

put feathers on one's own cap; blow/toot one's own trumpet

bring shame on sb

go in an eastward direction; go eastward