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Any of several freshwater bivalve mollusks of the genera Anodonta and Unio, found in the central United States, that burrow in the sand or mud of lakes and streams.

淡水蚌发现于美国中部的无齿贝属和珠蚌属几种淡水双壳软体动物的一种，在湖和河中的沙中或泥中挖洞

The results demonstrated that 22 of 50 were positive by PCR-ELISA method while only 7/50 and 18/50 by antiacid staining and culture respectively, and no positive result was found in 20 sputum specimens without Mycobacterium tuberculosis by the methods; Conclusion The pCR-ELISA method can objectively detect Mycobacterium tuberculosis from clinical specimens with high specificity and sensitivity.

对50份来自结核病人高度怀疑有结核分枝杆菌的标本检测表明，PCR-ELISA检出22份阳性，比抗酸染色法(7/50)、培养法(13/50)和PCR-电泳法(18/50)检出率高，而20份证实无结核分枝杆菌的标本，几种方法检查均为阴性。结论该法可敏感、特异和客观地检测临床标本中的结核分枝杆菌。

Aseptically packaged foods will keep without refrigeration for long periods of time, perhaps even years.

无菌包装的食品在没有冷藏的条件下可以保持很长时间，甚至可能几年时间。

The research status and development trend of several functional additives for internal combustion engine oil such as metallic detergent,ashless dispersant,antioxidant and corrosion inhibitor,friction modifier are presented.

介绍了金属清净剂、无灰分散剂、抗氧抗腐剂、摩擦改进剂等内燃机油几大功能添加剂的研究现状及发展趋势，并提出了今后润滑油添加剂的研究方向。

Let those whom Nature hath not made for store,Harsh featureless and rude, barrenly perish:Look, whom she best endow'd she gave the more;Which bounteous gift thou shouldst in bounty cherish: She carved thee for her seal, and meant thereby Thou shouldst print more, not let that copy die.

让那些人生来不配生育传宗，粗鲁、丑陋和笨拙，无后地死去；造化的至宠，她的馈赠也最丰，该尽量爱惜她这慷慨的赐予：她把你刻做她的印，意思是要你多印几份，并非要毁掉原稿。

As fast as thou shalt wane so fast thou grow'st, In one of thine, from that which thou departest, And that fresh blood which youngly thou bestow'st, Thou mayst call thine, when thou from youth convertest, Herein lives wisdom, beauty, and increase, Without this folly, age, and cold decay, If all were minded so, the times should cease, And threescore year would make the world away: Let those whom nature hath not made for store, Harsh, featureless, and rude, barrenly perish: Look whom she best endowed, she gave thee more; Which bounteous gift thou shouldst in bounty cherish: She carved thee for her seal, and meant thereby, Thou shouldst print more, not let that copy die.

和你一样快地消沉，你的儿子也将一样快在世界生长起来；你灌注给青春的这新鲜血液仍将是你的，当青春把你抛开。这里面活着智慧，美丽和昌盛；没有这，便是愚蠢，衰老和腐朽：人人都这样想，就要钟停漏尽，六十年便足使世界化为乌有。让那些人生来不配生育传宗，粗鲁，丑陋和笨拙，无后地死去；造化的至宠，她的馈赠也最丰，该尽量爱惜她这慷慨的赐予：她把你刻做她的印，意思是要你多印几份，并非要毁掉原稿。

And ourresearch focuses on the following aspects: position based beaconless routingalgorithm, performance comparison of position based and topology based routing,position based and topology based hybrid routing algorithm and routing maintenancealgorithm of DSR by using position information.

本文针对移动ad hoc网络中的路由技术，对移动ad hoc网络中的基于拓扑和基于位置的两大类路由算法和协议进行了总结和分析，集中研究了以下几个方面的内容：基于位置的无信标的路由算法，基于拓扑和基于位置路由算法的性能比较，基于拓扑和位置信息的混合路由算法，以及利用位置信息对动态源路由的路由维护进行改进的算法。

In the dim light he was just able to make out the form of a great bewhiskered fellow sitting on a bed, the top of his head swathed in a white turban.

那老者走上几步，向内张去，朦胧中见一名虬髯大汉在床上，头上包了白布，脸上并无刀疤，果然不是贾老六。

In this thesis, the structural heterogeneity of several novel polyolefin resins, including biaxially oriented polypropylene and propylene-ethylene random copolymer, was investigated.

本论文工作从聚合物链结构的多重非均匀性出发，研究了几种新型聚烯烃材料，包括用作双向拉伸薄膜的等规聚丙烯树脂和用作热水管材的无规共聚聚丙烯树脂的链结构。

Meanwhile in South Korea, U.S. boneless beef imports are due to resume within weeks, pending resolution of some minor disagreements.

同时在韩国，美国的无骨牛肉进口预期在几周内就将恢复，还有一些微小的争论待解决。

She gently rebuff ed him, but agreed that they could be friends

她婉言拒绝了，但同意作为朋友相处。

If in the penal farm, you were sure to be criticized.

要是在劳改农场，你等着挨绳子吧！