They have pleasant mouths turned up at the corners, to which the great Master of Marionettes has fixed the strings and he holds them in his nimblest fingers to twitch them at the slightest jest.
我不知道to which 在这里是什么用法，为什么译文会在这里翻译成就像木偶大师?
to which与fixed the strings构成fix something to something短语，意思为“将某物固定于某物”。这里的which引导定语从句，先行词可能是corners。
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