observance - типичные ошибки в английском со словом observance
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Не правильно ❌ Правильно ✅ Пояснение
This experiment requires very careful observance.

This experiment requires very careful observation.

observance = (1) the obeying of (a law or rule): 'the observance of a speed limit' (2) the keeping of (a custom or ceremony): 'the observance of religious holidays'
observation = the act of watching careful ly; the act of studying and making detailed notes: 'The patient was kept under observation for several weeks.'