这一物体太轻了而不可能是一个砖，然而它和固体燃料助推器上的泡沫的密度是相同的。
The object was too light to be a brick, but it was the same density as a piece of foam from a solid rocket booster.
煤砖，炭砖把煤灰，木炭或锯木灰和木片压缩制成的砖块状物，用作燃料和点火。
A block of compressed coal dust, charcoal, or sawdust and wood chips, used for fuel and kindling.
为了消除铬公害以及替代燃料的使用，研制水泥窑用碱性砖的无铬化势在必行。
Magnesia chrome bricks must be replaced by chrome free basic bricks because of chrome pollution and for utilization of substituting fuel in cement kiln.
为了消除铬公害以及替代燃料的使用，研制水泥窑用碱性砖的无铬化势在必行。
Magnesia chrome bricks must be replaced by chrome free basic bricks because of chrome pollution and for utilization of substituting fuel in cement kiln.
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