子非鱼1102
上升:increase, rise, grow, decline, reach a peak, fluctuate(有起伏,中性词), double, maintain a trend下降: decrease, drop, fall, treble, 常用来修饰上述动词的形容词有和副词有:rapid(ly), dramatical(ly), slight(ly), sharp(ly), gradual(ly), quick(ly), supervising(ly), wildly, mildly另外飞机起飞是 take off降落是 land down
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