obligate
[ˈɑblɪˌɡet]
vt.
使（在法律或道义上）负有责任或义务;
对…施以恩惠;
adj.
有义务的，必要的;
例句:
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The nature of the nutritional requirements for obligate parasites in nature is unknown.
人们还不知道自然界中专性寄生菌的营养要求的本质.
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All the photosynthetic bacteria possess the capability in addition to various facultative aerobes and obligate anaerobes.
所有光合细菌加上各种兼性的好氧生物和绝对的厌氧生物具有这种能力.
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Paul Ehrlich sees coevolution pushing two competitors into " obligate cooperation. "
保罗?埃尔利希认为共同进化推动两个竞争对手进入 “ 强制合作. ”
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He feared to obligate himself to do something.
来自T. Dreiser
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Some, such as cats and pinnipeds, are obligate carnivores.
来自BBC
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Lions are obligate carnivores, they must eat meat to survive.
来自SA