球石，即球形的石头或球形鹅卵石，分为人工球石和天然球石，因其具有耐高温高压，吸水率低，化学性能稳定的特点，被广泛用于石油、化工、化肥、天然气及环保等行业，作为反应器内催化剂的覆盖支撑材料和塔填料。
... 全圆 complete circle 球石 ball stone; ballstone; coccolith; pebble 全圆, 全圆环 full circle ...
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山东省滨海砂矿以石英、锆英石、磁铁矿、砂金等为主，其次为贝壳、球石、钛铁矿、金红石等。
Quartz, zircon, magnetite, gold are major constituents of littoral placers in Shandong province, while shell, ballstone, ilmenite, rutile being secondary.
在清朝时期，踢石球在中国北方是一种很流行的游戏，通常在冬天玩以保暖。
During the Qing Dynasty, kicking a stone ball around was a popular game in the northern part of China, and it was often played in winter to keep warm.
神秘的石球。
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