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So the research of the independency on binary random variable is an important task in probability theory,In this paper,the plenitudinous-indispensable condition distinguishingly the independency on binary random varable is given.

随机变量的独立性是概率论中最基本的概念之一，通过对它的研究可使许多实际问题的具体计算得到简化。

The Fujian fisherman has made extremely large contribution in cultivating ocean. Through the fishery levies duty they have supported the country and local finance,have promoted the Fujian development of the economy, and no doubtedly in developing the channel, the fishery and the island, they have been playing an indispensable role in the history.

福建渔民在开垦海洋中做出了极大的贡献，他们通过渔业课税的形式支持国家和地方财政，促进了福建经济的发展，并在开发航道、渔场和海岛上起着不可替代的作用。

To one who has real concern for the problems of china, the unique dualistic structure and its changes are indispensable.

中国独特的城乡二元社会结构与户籍管理制度是任何关注中国社会问题的人所不可忽视的。

Charge amplifier can be applied to Eclectics, Aerospace, Shipping and other important industry and its also an indispensable important means of teaching and research.

电荷放大器可以用于电子、航空航天、船舶等重要工业，同时也是教学科研不可缺少的重要手段。

Thus, endogenous Smad2 actiation is indispensable for endodermal and mesodermal induction in the early phase.

晚期阶段，TGF-beta通过介导Smad2活化，调节心肌细胞的增殖与分化，实现其负性调节心肌细胞生成的作用。

Preliminary bioassay showed that all the synthesized compounds just showed a poor inhibition rate (0~45%) at 500 mg/L, much weaker than (72%~87%). The result suggested that chloro-atom on 2-position of pyridine ring may be indispensable for herbicidal activity.

初步除草活性测定结果表明，在500mg/L剂量下，所有化合物的除草活性（抑制率0~45%）远低于先导化合物（抑制率72%~87%），说明吡啶环2-位上的氯原子可能对维持该类化合物的除草活性是必需的。

Dr. Barklair, the Britain hermeneutist of the famous Ireland "Bible", pointed out in his "Full of Flowery" that there were three indispensable factors in happy life that is hope, job and love.

当代英国爱尔兰著名《圣经》注释学家巴克莱博士在《花香满径》开篇中指出：&幸福的生活有三个不可缺少的因素：一是有希望，二是有事做，三是能爱人。&

In this field, the absorption on solid surface is the indispensable step of heterogonous catalysis, and the most widely applied catalysis is the one of gas on solid.

据统计，世界上85%的化学制品要依靠催化反应制得，而催化与吸附关系密切，其中固体表面的吸附是多相催化的必经步骤，应用的最为广泛的是气固相的催化作用。

The gear discussed in this text is the horological gear. Gear is the indispensable component of the mechanical watches, whose performance determines the accuracy of the timing of the watches.

中文摘要本文所研究的是机械钟表中的齿轮，齿轮是机械钟表中不可缺少的重要组成部分，其性能直接决定了钟表计时的准确性。

It is an indispensable method to improve family and school education, to create a favorable environment for students.The disadvantages of test-oriented education should be got rid of whilst Quality Education, especially the training of creativity should be energetically advocated to provide the students with a favorable atmosphere for competition. Reasonable goals for achievement should be set, and students should be encouraged to make unremitting efforts, to advance toward higher goals in thecourse of conquering difficulties and savoring success through positive guide and words stimulus. Approachable and imitable examples should also be set for students to make them practice continuous positi

以人为本，改进家庭教育和学校教育方法、营造良好的环境氛围是不可或缺的重要手段，要克服应试教育的种种弊端，大力提倡素质教育，特别是加大创新能力的培养，为学生创建良好的竞争氛围：要设置合理的成就目标，通过正面引导和言语激励，鼓励学生坚持不懈地努力，启发学生在战胜困难和体验成功中不断向更高的目标迈进：要为学生树立可接近和效仿的榜样，让学生不断进行良性的自我强化和替代强化：要帮助学生形成正确的归因，以保持较高的学业自我效能感和成就动机水平；同时要加强师德建设和教师的心理学修养，使教师在具有良好职业道德的基础上，依据心理学规律和学生个体的心理矛盾，在教学实践中因材施教，努力提高自己的教学能力。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。