Upper-middle reaches

Lower--middle reaches

Night Patrolling God in legendary superstition. Metaphor for people loitering outside late at night

being extra cautious and playing it safe

playing mahjong (slang)

swimming pool

swimming briefs; swimming trunks

(noun) Nomads

to be in the mood to go travelling / on an excursion

a cruise ship; boat rides

a protest; a demonstration

to persuade; to lobby

to go for a drive (for pleasure)

to be like fish swimming in a cooking pot -- in imminent peril

a man who loses position and influence may be subjected to much indignity

a loiterer [colloquial]

swimming pool

downstream

swim down

know how to swim

guerrilla

swim back and forth

travel

swimming

upstream

plankton

strive to be the best

lobby

float

midstream; middle status