The structure and wear resistance of layers of C-B double cementation of steels 20 and 45 have been studied.

本文研究了20 钢和45 钢的碳硼复合渗渗层组织及耐磨性能。

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One cup of kale (boiled, but not overcooked) gives you double the DV for vitamin A. You'll also get some vitamin C, a small amount of B vitamins and a generous amount of calcium.

一杯甘蓝（煮的，但不要煮过头）能带给您一天所需维生素A量的两倍。 您还能获得一些维生素C 和小部分的维生素B，以及大量的钙元素。

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In this case we have a double bond between a and b, and in this case we have it between b and c.

在这种情况下，我们在，A，与，B，之间有一个双键，而在这种情况下，双键在，B，与，C，之间。

麻省理工公开课 - 化学原理课程节选

The split voice, the development of what you could say is that racial double consciousness that W. E. B. Du Bois talks about, that double consciousness of the racial reality, is manifested in that split in the narrative.

在双重叙述中,双重语气表现了出来,这就是W。，E。，B，Du，Bois所说的，种族双重意识，的发展。

耶鲁公开课 - 1945年后的美国小说课程节选

You could recapitalize Company B and nearly double its value.

FORBES: Dow Jones Interactive

Typical double-B Cat bonds have rates five points above Libor, compared to three to four for corporate bonds.

FORBES: Catastrophe Bonds

It is mostly higher-rated paper with 28 of the combined 31 deals carrying at least one double-B rating.

FORBES: In low-rate environment, more "high yield" bond issuers forge into 4% territory