一成不变: nothing much changes (idiom); always the same, stuck in a rut...
搭: to put up, to build (scaffolding), to hang (clothes on a pole), to connect, to join, to arrange in pairs, to match, to add, to throw in (resources), to take (boat, train), variant of...
蹬: to step on, to tread on, to wear (shoes), (slang) to dump (sb)...
扑: to throw oneself at, to pounce on, to devote one's energies, to flap, to flutter, to dab, to pat, to bend over...
过错: mistake, fault, responsibility (for a fault)...
防汛: flood control, anti-flood (precautions)...
不敢当: I dare not (accept the honor); I don't deserve your praise, you flatter me...
边境: frontier, border...
皮球: ball (made of rubber, leather etc)...
认定: to maintain (that sth is true), to determine (a fact), determination (of an amount), of the firm opinion, to believe firmly, to set one's mind on, to identify with...