您要查找的是不是：
- biogenic chert 生物成因燧石
- Chert Jie is looking at some picture. 教师引导学生看主情景图。
- Fermentation is a biogenic process. 发酵是一种生物化学反应过程。
- Thus perhaps even clouds and rain may be biogenic. 以此推论，甚至乎云层雨水也是由生物活动产生的。
- Any of various hard,dark-colored rocks,especially basalt and chert. 暗色岩一种坚硬、暗色的岩石，尤指玄武石及燧石
- The sediments in this photo curve near the ends of chert pods. 这沉淀物在这幅图片的曲线近似冷凝物的黑矽石的扁豆形矿体。
- Paleontologists know chert as a good place to look for fossils. 古生物学家以黑硅石为化石采集地点的标志。
- Thus we can better understand the deformation of chert in a highly fluid form. 这样我们就能更好地理解燧石在高度流体状态时的变形情况。
- Any of various hard, dark - colored rocks, especially basalt and chert. 暗色岩一种坚硬、暗色的岩石，尤指玄武石及燧石
- Effect of biogenic hydrocarbon to photochemical pollution in Guangzhou. 天然源排放碳氢化合物对广州地区光化学污染的影响。
- Any of various hard, dark-colored rocks, especially basalt and chert. 暗色岩一种坚硬、暗色的岩石，尤指玄武石及燧石
- Abundant biogenic school graduates due to the good situation of the school. 该校生源充足缘于该校毕业生就业的良好形势。
- Sleep and food and water are among the biogenic needs of the organism. 睡眠、食物和水属于生物体的基本需要。
- The thin-beded siliceous-rocks include chert and depositional quartz with textures of oolite and pebble. 矽质岩包括燧石和沈积石英岩，呈薄层状产出，沈积石英岩具鲕状、砾状结构。
- Carbonate rocks are predominantly composed of intra-clastic dolostone, chert dolostone and sand-bearing dolostone. 碳酸盐岩以内碎屑白云岩、燧石白云儿和含砂白云岩为主。
- The cardium sandstone is lithic, being composed of grains of chert, quartz, quartzite, silicified argillite, and other rock fragments. 卡迪砂岩是岩屑砂岩，由燧石，石英、石英岩、硅化泥板岩和其它岩石碎屑颗粒所组成。
- Biogenic amine is a kind of low molecular compounds belonging to nitric fatty group or heterocycle group. 生物胺是一类含氮的脂肪族或杂环类低分子化合物。
- However some social groups within Centaurus space, mistrusting the augmentation of their natural biology, rebel against Biogen treatment. 在半人马座空间内的一些社会团体虽然不相信他们的自然生物的增加，但是仍然反对生命素治疗法。
- Chert with good abrasion is the major content in conglomerate, and diamonds are contained in it generally. 砾岩主要砾石成分为燧石,磨圆度较好,普遍含金刚石。
- They have an established religion, the Harmony, and developed an eugenic program called Biogen. 他们信仰美好的（事物）他们发展了一种优生学叫“初生代”。
