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..,
触底:
bottom out, hit a trough, reach a low point, reach the rock...
稳定:
level out, even out, remain stable/still/steady, stay constant,
keep its stability, remain unchanged...
变化急剧地:
dramatically, drastically, sharply, hugely, enormously, considerably,
significantly, markedly, surprisingly, noticeably, substantially...
突然地: abruptly, suddenly
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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