表示上升:

  climb, go up, ascend, shoot up,creep up, surge, boom, accrue,

  leap, soar, jump, increase, rally, rise, rocket, improve,

  表示下降:

  go down, fall, fall off, drop, slump, decline, decrease, plummet, slide, slip,

  shrink, dip, reduce, descend, sink, subside, ebb, creep down,

  到达顶部:

  top out, peak, reach a peak, reach the highest point, peak at..,

  稳定:

  level out, even out, remain stable/still/steady, stay constant,

  keep its stability, remain unchanged...

  significantly, markedly, surprisingly, noticeably, substantially...

  平稳地:

  steadily, smoothly, slowly, marginally, gradually, moderately, mildly...

  波动:

  fluctuate, witness/display/demonstrate a fluctuation,

  go ups and downs, increase with fluctuation(波动式增长)

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