對流層頂

tropopause / top of troposphere

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

convection

to flow / to disseminate / to circulate or spread / to move or drift / to degenerate / to banish or send into exile / stream of water or sth resembling one / class, rate or grade

troposphere / lower atmosphere

to pile on top of one another / layer; stratum / floor (of a building); story / (math.) sheaf / classifier for layers

apex / crown of the head / top / roof / most / to carry on the head / to push to the top / to go against / to replace / to substitute / to be subjected to (an aerial bombing, hailstorm etc) / (slang) to "bump" a forum thread to raise its profile / classifier for headwear, hats, veils etc