Rather than being caused by an overenthusiastic immune system, milk intolerance, for example, results from a lack of the enzyme the body needs to break down lactose, the main sugar in milk.

举例来说，不耐乳症不是由免疫系统的过分热情引起的，而是缺乏一种酶的结果，而身体需要这种酶来分解牛奶中主要的糖——乳糖。

youdao

Theories range from the extinction of the mammoth to sudden environmental changes caused by a comet impacting or earth or the break of a massive freshwater lake, lake Agassiz.

这些理论包括猛犸象的灭绝、因彗星或地球引起的环境剧烈变化、以及阿加西湖淡水的减少。

youdao

The scourgestones are weak when separated from the skeletal grasp that once held them. Simply holding them in my hands has caused them to fracture and break.

当天灾石离开那些曾经握着它们的骷髅的手后就变得很脆弱。轻轻地把它们握在手中就让它们变得粉碎。

youdao

Reid had been confident of his plan to give Hearts more of the ball and try to catch them on the break, but patient build-up play from the visitors caused him to abandon his tactics in the second half.

BBC: Hamilton boss Billy Reid bemoans team inconsistency

But the rapid rise in fishermen from outside the islands has caused this process to break down.

ECONOMIST: The Galapagos Islands: Fishermen’s friends? | The

"The break-in and subsequent fire caused the charity a serious setback and prevented very ill children and their families from enjoying a holiday together, " he said.

BBC: Blackpool's Donna's Dream House fire: Two youths detained