空然是一个汉语词汇，解释为空虚貌、徒然。
腹空然 hungry
空灵自然 Natural Portrait
自然空间辐射 natural space radiation
自然空间 natural space ; naturespace
自然空气冷却 natural air cooling ; AN Air natural cooled
空气自然冷却 AN ; AN air natural cooled
自然空调 natural air conditioning ; natural ventilation
自然空冷发动机 Naturally air cooled engine
空气自然卷入 natural air entrapment
自然空气 natural air ; AN
采用了专用的燃气汽车控制策略及高精度的燃气系统关键部件，实现了全功况的下的空然比精确控制。
With the dedicated CNG control strategy and quality kits, the air-fuel ratio was well controlled in all CNG operating conditions.
维特比译码算法是一种最大似然译码，它可以得到较高的译码速度以及译码计算时间固定，因而在深空通信中得到广泛应用。
Viterbi algorithm is a kind of maximum likelihood decoding method, which can obtain high decoding speed and cost fixed decoding time, so it is widely used in deep space communication.
这些编码是四次群最大似然可译分布空时编码，并且功率在中继之间随时间均匀分布。
These codes are four-group ML decodable and have uniform distribution of power among the relays as well as in time.
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