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Out of necessity; through restriction to such a mode of life or such environmental conditions.
Early 20th century; earliest use found in Science. From obligate + -ly.
雅致网英汉双解词典包含236457条英汉翻译词条，涵盖了常用英语单词及词组短语的翻译及用法，是英语学习的必备工具。