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单词 pre-chemical
释义

> as lemmas

pre-chemical
pre-chemical adj.
Brit. /(ˌ)priːˈkɛmᵻkl/
,
U.S. /ˌpriˈkɛmək(ə)l/
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the world > matter > chemistry > chemical substances > [adjective] > of or relating to chemicals > before chemicals
pre-chemical1916
1916 Proc. Royal Soc. 1915–16 A. 92 385 They [sc. steps in ignition] must be regarded as pre-chemical atomic combination, caused by direct electrification.
1996 Econ. Hist. Rev. 49 214 Both constraints, operating within the context of pre-chemical and pre-mechanical agricultural sytems,..limited the scale and scope of French endeavours to follow the path taken by Britain.
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