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Baktun cycles having 400-years increment the secondary age category and synchronize the primary ages.

baktun周期有400年增量中学时代同步类初级佳话。

The present balanced two-layer sample rotation system is applicable only to the monthly survey with two-stage sample designs and with small primary sampling units.

目前的平衡两层次样本轮换模式只适用于一级单元规模较小时的两阶段抽样月度调查。

As an important component of it,Aerodynamic property is the primary bases of ballistic curve calculation, load calculation,controlling parameter choice, the pushing force of engine choice and material choice,therefore, it is very important to researching the aerodynamic property .

气动特性作为其研究过程中的主要组成部分，它是进行弹道计算、载荷计算和控制参数选择、发动机推力选择、材料选择的原始依据。

The primary principle of micro-impulse measurement using laser interferometry is described, and impulse can obtained by measuring tiny vibration of ballistic pendulum.

对激光干涉仪测量微冲量的原理进行了初步研究，将激光与靶材相互作用产生的微冲量转化为冲击摆的微幅振动，通过激光干涉仪辨识此振动以获得冲量。

Finally, the study primary indicate three ecological zone ,named urban core zone, urbanize zone, banlieue, and defined itself ecological relationship. Simultaneity, this syudy indicate cardinal urban space development problems about population, land, economic activities by the spatial structure analysis. And it directs this problems to offer countermeasure.

进而利用台中市相关数据初步地辨识出都市中心、都市化地区及市郊区等三个都市生态空间区域，指出其生态关系，并透过空间结构分析明确台中都市发展在人口、土地和经济活等三方面的主要问题，从环境保护的角度，对台中都市生态系统空间结构的问题提出改善建议，供台中都市空间规划参考。

Although Ma Yun ever explained banteringly,"Shanghai crosses state-owend enterprise trade blossom everywhere, if settle Shanghai, we are one of hundreds of sons at most, but in Hangzhou big different, we but ' singleton '", but apparent, this is not the most primary reason.

尽管马云曾半开玩笑地解释，"上海跨国企业遍地开花，假如落户上海，我们顶多算是几百个儿子中的一个，但在杭州就大不一样了，我们可是'独生子'"，但显然，这并非最根本的理由。

All-out Defense Education are not only the primary goal of each states' defense development in 21st century, but also the necessary mechanism to pass the baptism of fire as being threaten with invasion.

全民国防是21世纪世界各国国防发展的主轴，也是检验一个国家一但面临外患时，能否经得起战争考验的必要机制。

Like a simple bar magnet, this field's primary magnetic flux is directed out from the core in the Southern Hemisphere and down toward the core in the Northern Hemisphere.

地磁就如同一根普通的磁铁棒，而这个磁场的主要磁通量是在南半球由地核向上穿出，并在北半球向内进入地核。

Primary care practitioners and patients should try to avoid the use of narcotic or barbiturate medications that may exacerbate migraine; if these drugs are necessary, patients should be advised of the risks of medication overuse and dose limits should be applied.

" "初级保健医生和病人应尽量避免使用麻醉或巴比妥类药物可能会加剧偏头痛；如果这些药物是必要的，患者应该被告知风险的药品过度使用和剂量限值应适用。

Cancer is currently the primary against humanity, life-threatening diseases, around the world about 15 million patients suffering from malignane tumors ,people who die each year from cancer, with about sever million, to families and society of the disaster and unable to assess the heavy finaucial barden of .

癌症是当前危害人类生命的首要疾病，全世界罹患恶性肿瘤的病人一千五百万左右，每年死于癌症的人约七百万，给家庭和社会带来了沉重的灾难和无法估量的经济负担。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐