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look high and low

1.The Direct Digital Frequency Synthesizer is a kind of fully digitized frequency synthesizer, which consists of the phase accumulator, the sine look-up table, the digital to analog converter and the low band filter. It is of high frequency resolution, fast frequency switching speed, low phase noise, the ability to switch frequencies while maintaining constant phase, and the ability to producing arbitrary waveforms.

直接数字频率合成器(DDS)是一种全数字化的频率合成器，由相位累加器、波形ROM、D／A转换器和低通滤波器构成，DDS技术具有频率分辨率高、频率切换速度快、频率切换时相位连续、输出相位噪声低和可以产生任意波形等优点。收藏指正

2.The hard test is whether in 50 years Americans will look back at 1998 and say that we raised the bar for public office so high that only saints need apply, or that we dropped it so low that moral authority fell out of the job description.

严峻的考验在于——在今后的五十年中，美国人是否会回首一九九八年，并因此说：我们对公职的要求太高，以至于只有圣人才会申请；或者说我们把标准降得太低，以至于道德威信不再属于工作职责之列。收藏指正

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