显然这看起来是一个问题，因为我们知道实际上，甲烷是四价的，而这告诉我们它仅仅是二价的。
So this should immediately look like a problem because we know, in fact, that methane is tetravalent, and this is telling us it's only divalent.
一种四价流行性脑脊髓膜炎疫苗（已在美利坚合众国获许可证）和一种预防脑膜炎A和C的七价疫苗（将于2007年注册）；
A tetravalent meningococcal meningitis vaccine (licensed in the United States) and a heptavalent vaccine protecting against meningitis A and C (to be licensed in 2007);
中金所为上述四张合约设定了一个3399点的基准价，略高于周四的收盘价。
The exchange set a base price at 3399 for all four contracts, slightly above Thursday's close.
星期四的发行价和当天股价的大幅的上升让人回想起雷曼兄弟破产之前的那段时间，收益大增的同时，亚洲股市出现又一轮的走弱。
The initial value and the sharp rise on Thursday recalled the days before Lehman Brothers collapsed, and the gains bucked another weak session for Asian stock markets.
该公司在深圳上市，其股票周四的收盘价为人民币18.20元，跌0.4%，但仍较年初上涨92%。
The Shenzhen-listed stock lost 0.4% Thursday to end at 18.20 yuan, up 92% so far this year.
即便在周四股价上涨5.2%之前，平安保险的市盈率已是今年预期收益的34倍，账面价值的12倍。
Even before Thursday's 5.2 per cent rise in its stock price, Ping an was trading on 34 times this year's forecast earnings and 12 times book.
中粮屯河周四的收盘价为人民币19.36元，约涨2.64元，较年初累计上涨了156%，远远超过上证综合指数同期98%的强劲涨幅。
On Thursday, Cofco Tunhe shares finished at 19.36 yuan, about $2.64, up 156% so far in 2007, handily beating the benchmark Shanghai Composite Index's powerful 98% rise this year.
净石油现价是Correa先生预期达到的欧洲碳排放信用额市场价的四倍多。
The oil’s net present value is over four times greater than the market price of the European carbon credits Mr Correa hoped to obtain.
6月30日发布的最新Case - Shiller指数显示，四月房价继续下跌：十城市指数较一个月前下跌0.7%，二十城市指数下跌了0.6%。
The latest Case-Shiller indices, released on June 30th, showed that prices continued to fall in April: the ten-city index was 0.7% lower than a month earlier, and the 20-city index went down by 0.6%.
但是他建议人们还是要四处比价，每天看一下价格，因为最好的成交价不是永远都出现在周日或者周二的。
But he recommends people shop around and check prices every day as the best deals may not always be offered on a Sunday or Tuesday.
细胞中四价体的平均数目不仅在四倍体大白菜品系间存在着差异，在植株间也表现出明显地变化。
The mean numbers of the quadrivalents in the cells existed difference not only in the species but also in the individual plants of the autotetraploidy Chinese cabbage.
每个碳原子的价键为四。
该项目是为四川成都网通公司实现的综合计费系统，包括话单的采集、批价、以及经营分析系统。
The project is a comprehensive billing system designed for Sichuan Chengdu Netcom Corporation, including call record collection, rating and operation analysis system.
结论所研制的综合培养基及多糖纯化的工艺具有较好的可行性，为四价脑膜炎球菌多糖疫苗的研制提供了试验基础。
Conclusion the developed synthetic medium and purification procedure were feasible and provided an experimental basis for the preparation of tetravalent meningococcus polysaccharide vaccine.
作了总硒和四价硒的回收，平均回收率为91—105％。
本文主要介绍有机硼试剂，包括烷基硼烷，烯基硼烷及一些四价硼酸盐类，在碳碳键形成中的应用。
The review deals mainly with the application of organoboron reagents including aikylboranes, vinylborancs and some organoborates in carbon-carbon bond formation.
碳的化合价是四价。
钯的，四价钯的：含有或指明含有钯的化合物的，尤指带有4价的。
Of or designating compounds that contain palladium, especially with valence 4.
硅原子占据了氧原子之间的空隙并且和四个氧原子共用化合价。
The silicon atom occupies the space opening( interstice)between the oxygen atoms and shares four valence electrons with the four oxygen atoms.
实验二根据调节性匹配理论编制了四个情景问卷，以调节定向类型和结果效价不同的组合表达同样的信息。
In the second experiment, we design four scene-questionnaires which send the same information by different combination with the type of regulatory focus and result valence.
本文主要讨论了四价铈产品中铈的价态分析问题。
This paper has discussed the problem about analysis of different valence states of cerium in ceric products.
周四纽约商品期货交易所（New York MercantileExchange） Comex分部的黄金期货收盘价报每盎司1，331.60美元，较前日微涨，但和一年前相比仍下跌了16%。
Gold futures ended Thursday at $1,331.60 a troy ounce on the Comex division of the New York Mercantile Exchange, up slightly for the day but down 16% from a year ago.
结果显示配合物3有四边形孔穴的结构，荧光性能显示可以探测二价镁离子。
The results show: complex 3 have a square-like hole and may be employed in probing Mg~(2+) for use in fluoroimmunoassays.
在第四季度，铜价跌破了记录以来的51%。
In the fourth quarter, copper prices plunged a record 51 percent.
在第四季度，铜价跌破了记录以来的51%。
In the fourth quarter, copper prices plunged a record 51 percent.
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