In the 1960s and 1970s, most personal and corporate planes were propeller or turbo-prop aircraft, which fly at a lower altitude than jetliners.
在1960和1970年代，大部分个人和企业的飞机是飞行高度低于喷气式飞机的螺旋桨式或涡轮螺旋桨式飞机。
Sometimes an eagle flies lower than a chicken, but the chicken will never fly as high as the eagle .
鹰有时比鸡飞得还低，但鸡永远不能飞得像鹰那样高。
Sometimes the eagle flies lower than the chicken, but the chicken can never fly as high as the eagle!
鹰有时飞得比鸡还低，但是鸡永远无法飞得象鹰那么高！
In addition, the cost of fly ash and slag cement or ash is much lower than cement.
另外，粉煤灰、矿渣粉和灰渣的成本较水泥要低的多。
The results show that the degree of hydration of fly ash-cement paste is higher and the porosity is lower than pure Portland cement paste in late ages.
结果表明，与纯硅酸盐水泥相比，粉煤灰水泥水化后期的水化程度较高，浆体总孔隙率较低。
In order to reduce the cost and increase the RPC strength, the substitution of mixed minerals such as ultra-pulverized fly ash for silica fume quantity can be lower than 20%.
为降低成本而又不大幅度损害活性粉末混凝土的强度，超细粉煤灰等矿物掺合料替代硅灰的量不宜超过加20%。
It's possible that the fly lived during a period when sea levels were much lower there than they now are.
很可能，苍蝇生长的那个时期，海水没有现在那么高，这意味着陆地面积更大。
It's possible that the fly lived during a period when sea levels were much lower there than they now are.
很可能，苍蝇生长的那个时期，海水没有现在那么高，这意味着陆地面积更大。
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