At a time when natural history was a valuable tool for discovery, Merian discovered facts about plants and insects that were not previously known.

在那时，自然史是很有价值的探索工具，梅里安发现了有关植物和昆虫的真相，这些真相从未为人所知。

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He seemed likely to become a country priest like hundreds of others, sharing his time between his work and his interest in natural history and country life.

看来，他像数以百计的其他学生一样可能成为一位乡村牧师，工作的同时，还可以兼顾自己对博物学和乡村生活的兴趣。

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Since time immemorial, infectious diseases have had a dramatic impact on human history. They have affected-and been affected by-economic conditions, wars, and natural disasters.

远古以来，传染病对人类历史有着引人注目的影响。传染病影响了——并且受到了经济状况、战争和自然灾害的影响。

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"Surgery produced a one-time benefit but did not modify the subsequent natural history of the disease, " the doctors said.

BBC: Doctors back 'controversial' operation

Ms. Siedman says such a time lag in getting the data out might result in a situation where there are still multiple natural-history studies in Sanfilippo syndrome.

WSJ: Families Push for New Ways to Research Rare Diseases