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Nona The BritI agree with you Taka.I see. Thank you, MH and nona (nona with beard! Oh, my...)
AnnvanI think your book is probably right. See: "... an ever-present part of the environment..." - that would fit "fixed in nature" as being 'fixed in the natural environment'.If you are a native speaker of English, tell me. What exactly is the fixation of time in the natural environment to you native speakers?