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)