碳酸钙是高分子材料中常用的无机填料，在高温时会分解放出二氧化碳而失重。
As a common inorganic filler in macromolecular material, calcium carbonate decomposes at high temperature with the removal of carbon dioxide.
只有那些由于经年使用 而严重受到磨损、或因任何方式损坏或损失重量的银币继续流通使用；将这些银币出口以及在黄金市场上销售也不值得。
Only those silver coins which were much worn by usage or in any other way defaced or reduced in weight remained in current use; it did not pay to export and to sell them on the bullion market.
为了不上太空而体验失重，飞机进行了“过山车”式的俯冲，在一小时的飞行期间，迅速爬升和下降。
To recreate the weightless experience without going into space, the plane executed parabolic flight maneuvers, climbing sharply and descending several times during the one-hour flight.
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