Habitat loss and fragmentation is the primary cause of population, metapopulation and species extinction worldwide.

生境丧失和破碎化是生物多样性丧失的主要原因，并得到了广泛的关注。

Objective To investigate the clinical features of primary angiitis of the central nervous system (PACNS).

摘要目的探讨原发性中枢神经系统血管炎(PACNS)的临床特点。

The primary task of the chair is to ensure the meeting runs smoothly.

主席的首要任务是确保会议顺利行。

Objective To explore the surgical treatment of primary small-cell esophageal carcinoma(PSEC).

目的探讨原发性食管小细胞癌的外科治疗方法。

Acropetal differentiation of the cambium layer continues as the primary root elongates.

形成层的向顶分化像初生根伸长一样在行。

Demonstrates efflux force plays primary role in segregative effect of air curtain.

指出气幕射流力对气幕的隔断用起主要用。

Protoxylem The PRIMARY XYLEM elements that are formed from the procambium first.

初生木质部的成分，最早由原形成层形成。

Primary repair for an abdominal wall defect with nonabsorbable sutures is advised when feasible.

如允许的话，术中可直接用不可吸收的线来修补腹壁的缺损。

This is the primary impetus behind the economic recovery.

这是促使经济复苏的主要动力。

Intake in state primary schools is down by 10%.

公立小学入学人数下降了10%。

Background—The nucleus tractus solitarius (NTS) is the primary integrative center for baroreflex.

背景-孤束核为压力感受器反射的主要中枢。

Primary violarite has comparatively big particle size,and it is considered the easiest flotation copper-niekle-sulphide ore.

紫硫镍铁矿原生粒度较大,被认为是最易浮选的硫化铜镍矿物。

Results OSAHS can be misdiagnosed as primary hypertension, arrhythmia, asthma,acalcerosis and some other diseases.

结OSAHS易被误诊为原发性高血压、神经官能症、儿童弱智、缺钙、心律失常、哮喘等。

By pre aeration in tanyard wastewater, the effect of primary settling improves obviously.

制革污水采用预曝气处理后，可大大提高初沉池沉淀效。

Field cancerization was the base of double primary lung cancer.

区域性癌化是双原发性肺癌发生的病理基础。

The primary function of a house is to provide warmth and shelter.

住宅最基本的功能是提供温暖，遮蔽风雨。

The primary method in calculi can only solve a thimbleful type of evaluations of infinite integral.

无穷限积分是微积分学中广义积分的一种类型,是积分知识的一个难点内容。

The primary inverter driving circuit,current foldback circuit,protection circuits for overheat and lowvoltage circuit are introduced specially.

重点介绍了一次逆变的驱动电路及过流、过热、过压保护电路。

Objective To investigate methods for the diagnosis and treatment of primary angitis of central nervous system (PACNS).

目的研究中枢神经系统原发性血管炎(PACNS)的诊断与治疗方法。

Objective To approach the protective effect of shujing meigui jiaonang(menalgia-relieving rose capsules) on mice s primary menalgia.

目的探讨舒经玫瑰胶囊对小鼠原发性痛经的保护用。