painstakingly
adverb uk/ˈpeɪnzˌteɪ.kɪŋ.li/ us/ˈpeɪnzˌteɪ.kɪŋ.li/
精心地;悉心地，刻苦地
in a way that shows you have taken a lot of care or made a lot of effort
She painstakingly explained how the machine worked. 她悉心地解释这台机器是如何运转的。
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