The second part have explained prosperity of Rangaku.
第二部分阐述了兰学的发展与兴盛。
参考来源 - 兰学的传播发展及其对明治维新的影响
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Rangaku
abstract:Rangaku (Kyūjitai: }}/Shinjitai: }}, literally “Dutch Learning”, and by extension “Western learning”) is a body of knowledge developed by Japan through its contacts with the Dutch enclave of Dejima, which allowed Japan to keep abreast of Western technology and medicine in the period when the country was closed to foreigners, 1641–1853, because of the Tokugawa shogunate’s policy of national isolation (sakoku).