For about a generation, the U.S. surfed on a growing wave of debt.
差不多有一代人的时间，美国在越积越高的债务上玩冲浪。
It also presents the realization of wave form generation with DDS technology.
采用直接数字频率合成(DDS)技术，实现波形发生器。
It also presents the realization of wave form generation with DDS technology.
采用直接数字频率合成(DDS)技术，实现波形发生器。
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