最常见的空间是那些由松散的、未固结的砂和砾石组成的颗粒（沙粒和小卵石）之间的空间。
The commonest spaces are those among the particles—sand grains and tiny pebbles—of loose, unconsolidated sand and gravel.
今天刚刚上班，小徒弟跑过来：师父今天我看到船台的那条快下水的船很奇怪，好好的螺旋桨又是打砂又是喷漆。
Todaywhen I just to begin the work, the small disciple come to ask me: master, I sawthe berth of the quick launching ship is very strange, the good propeller is sandingand painting.
大坝垫层料采用以天然砂砾料为主、掺入小石和粗砂以调整级配的方式生产。
The cushion layer for the dam is constructed with the material prepared mainly with natural sandy gravel and mixed with proper amount of pebble and coarse sand.
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