在美国，婚床与钻戒、多层婚礼蛋糕、情侣马提尼酒一样都曾是婚姻的象征，但它们正在面临绝迹的威胁。
The marital bed, once the symbol of American matrimony on a par with the diamond ring, the tiered wedding cake and his-and-hers martinis, is threatened with extinction.
研究了顶层进料均匀性、进气及排气方式对多层流化床流化料层高度均匀性的影响。
The top material admission balance, gas admission, gas exhaust effect of the uniformity of fluidized heights in multistage fluidized bed were studied.
多层旋转床的分离能力比单层旋转床强得多。
The separation ability of the three-layer zigzag rotating bed is much higher than that of the single.
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