They operate at extremely high efficiency, and their main by-product is water.

这种电池的使用效率极高，而主要的副产品只是水。

youdao

It is also a main by-product of biodiesel production.

它也是生物柴油生产中主要的副产品。

youdao

The main by-product during the production of acrylonitrile is acetonitrile.

乙腈是丙烯氨氧化制丙烯腈的主要副产物，用途很小。

youdao

When the top of the main shoot is removed by pruning or breakage the auxin is no long produced.

VOA: special.2009.10.06

So you have three main trade routes that cross the country, and they were used by trading caravans that would carry gold and grain and spices and textiles and other goods between Egypt and the rest of the Fertile Crescent and up into Asia Minor.

你有三条主要道路穿过这个国家，他们被通商的车队所使用,驮着金子，谷物，香料，纺织品和其他货物,在埃及与其他肥沃的伊斯兰教国家间,向上到达小亚细亚。

耶鲁公开课 - 旧约导论课程节选

Of course, other stocks are held by institutions on their behalf, but in terms of direct ownership, homes are the main thing that people own.

当然,他们还通过金融机构,间接持有股票,但从直接持有的角度来看,人们拥有的主要财产就是住宅

耶鲁公开课 - 金融市场课程节选

Engineers had isolated the large water main by 1730 BST.

BBC: People evacuated after pipe bursts in Huyton

Though anecdotes abound of candidates being vetted by party operatives, the main means by which the Conservative government ensured that quango boards were broadly sympathetic was a legitimate one: they asked the appointments panels to seek people with business experience.

ECONOMIST: Who��s really who | The

It was a three-generation affair for the Sawtelle family, meanwhile, with grandmother Anna Kristina Sawtelle, 76, from Ogunquit, Maine, by way of Sweden, attending the main ball by wheelchair.

NPR: Smaller Crowd, But Still Excitement This Time