Hydrogen is lighter than air, but compressing it, storing it in tanks and adding all the necessary equipment starts to tip the scales towards heavy again.
氢气比空气轻，但是将它经压缩存储在燃料箱中并添加所有必需设备后飞机又变重了。
A promotional video at the centre shows the plant's plans to reduce emissions through carbon capture and storage and by drying the brown coal and compressing it into coal pellets for export.
中心的宣传视频显示工厂计划通过碳捕捉和存储，以及干燥褐煤，压缩成碳颗粒用于出口来减少排放量。
Before implantation, the flexible double-disc patch is pulled into a catheter, collapsing and compressing it lengthwise.
在植入前，可弯曲的双片补片被拉入导管。
Before implantation, the flexible double-disc patch is pulled into a catheter, collapsing and compressing it lengthwise.
在植入前，可弯曲的双片补片被拉入导管。
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