A variety of documentation indicates that certain goods, once made by a family member as one of many duties, were later made by skilled artisans.

各种各样的文件表明，某些货物曾经是由家庭成员负责制作的，后来由熟练的工匠制作。

youdao

youdao

youdao

I'll use that one as the example because it's a familiar one to most people and you know that the protein insulin is made only in your pancreas and certain cells of the pancreas.

我把它作为例子,是因为大多数人都很熟悉它,胰岛素只在胰腺中进行合成,某些胰腺细胞能够合成胰岛素

耶鲁公开课 - 生物医学工程探索课程节选

Bayern Munich made certain of the runners-up spot -- and a place in the Champions League group stage next season -- with a 2-1 home win over Stuttgart who could have overtaken the deposed champions.

CNN: Wolfsburg win first German league title

The rules made sales of certain cuts of beef illegal and had a devastating effect on the UK's agricultural industry.

BBC: News Online

Engineers had learned that a resistor, which restricts the flow of electrical current, is best made of certain materials and a capacitor, which stores electrical charge, of others.

ECONOMIST: Jack Kilby