1.Fertilization is external, producing free-living planula larva.

1.体外受精，能产生自由活动的浮浪幼虫。

2.The engine is external to the boat.

2.发动机在船舷之外。

3.The external auditors come in once a year.

3.外聘审计员每年。

4.The external features of the building are very attractive.

4.这座建筑物的外观是很吸引人的。

5.Objective To construct goat tibial diaphyseal defect model by using half-ring sulcated external fixator.

5.目的探索半槽外固定器建立山羊胫骨段缺损模型。

6.We describe the “second quantized” Dirac theory in an (unquantized ) strong external field.

6.我们描述种（非量子化的）强外场中“二量子化”狄拉克理论。

7.Single cancellous osteomas, unlike exostosis, are a relatively rare lesion in the external auditory canal.

7.单性疏松骨瘤，不像外生骨疣，是个外耳道较少见的病灶。

8.This machine is extensively used for external packaging in such industries as medicine,food,drinks,dairy,cometic.

8.用于啤酒、饮料、乳品、罐头、日化等产品的二集束包装。

9.Rupture disks relieve overpressure in cylinders that may result from an external fire or from overfilling.

9.破裂释放钢瓶内可能源于外部着火或过量灌装的过多的压力。

10.Autonomic movements (autogenic movements;spontaneous movements) Movements of plants in response to internal rather than external stimuli.

10.对刺激做出反应但不趋向刺激源的种运动。

11.Use Head-space automatic injection method, isolating with the nonpolarity flexibility capillary column, calculating with external method.

11.采用外标法顶空自动进样，在非极性弹性毛细管柱上进行分离，效果良好。

12.The armour protection is tuneable by the replacement of armour packs within the vehicle's external skin.

12.防护甲是设计在车辆内衬板里，可以拆换的。

13.Finally there are external effects: the unpriced costs reflected in the modern environmental crisis.

13.最后是由外部效应：未标价的成本反映在现代机中。

14.Methods Thirty-four patients with pancreatic pseudocyst underwent pancreatic pseudocystogastroduodenal septostomy(PPGDS) and transgastric pseudocyst internal and external drainage(IED).

14.收集34例临床资料,观察其治疗结果及远期疗效。

15.Conclusion The zine oxide phosphorate base was a kind of effctive measure to prevent post-bleaching external cervical resorption.

15.结论磷酸锌水门汀基是防治内漂白后牙颈部外吸收的种有效方法。

16.Cleavable block copolymers could be cleaved into separate homopolymers under external stimuli (such as heat, light or agents).

16.这种聚合物在外部刺激下（如热、光、特殊试剂等）可以发生解离，从而变为两段均聚物。

17.And demodectic acne rosacea, demodectic blepharitis, demodectic pruritus in external auditory meatus and demodectic papillitis are the common demodicidosis.

17.蠕形螨病好发部位多见于鼻、睑缘、外耳道,面部皮肤等。

18.The preparation and application of internal and external sulfonium cationic polymer since 1960s are summarized comprehensively in this paper.

18.较全面地综述了国内外自60年代以叔锍阳离子聚合物的制备与应用情况。

19.Objective To evaluate the clinical significance of gastroduodenal septostomy internal and external drainage in the treatment of pancreatic pseudocyst.

19.探讨对胰腺假性囊肿胃、十二指肠隔障造口内外引流术的临床价值。

20.Conclusion The lacrimal pathway obstruction after external dacryocystorhinotomy can usually be cured by the transnasal endoscopic examination and treatment.

20.结论对经鼻外泪囊鼻腔吻合术后泪道不通病例，鼻内镜下对吻合口进行检查，针对不同情况进行相应处理，常能使病人再康复。