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clockwork (n.)
[clockwork 词源字典]
also
clock-work
, 1660s, "mechanism of a clock," from
clock
(n.1) +
work
(n.). Figurative sense of "anything of unvarying regularity" is recorded earlier (1620s).
[clockwork etymology, clockwork origin, 英语词源]
[clockwork 词源字典]