频繁: frequently, often...
弊端: systemic problem (sometimes refers specifically to corrupt practices)...
累积: to accumulate...
感到: to feel, to sense, to have the feeling that, to think that, to move, to affect...
叫: to (be) call(ed)...
打雷: to rumble with thunder, clap of thunder...
轮流: to alternate, to take turns...
可怜: pitiful, pathetic, to have pity on...
要不是: if it were not for, but for...
碰到: to come across, to run into, to meet, to hit...
