数据显示，尽管传统旅行社的销售量出现了几次上下波动，但整个2008年下半年在线预订量保持稳定。
Figures indicate that while sales through traditional agencies have spiked and troughed several times, online bookings held steady throughout the second half of 2008.
电源电压应保持稳定，其波动值不超过额定电压的15％。
The voltage should stable and amplitude should not over 15% of rated voltage.
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