if and only if是什么意思？

• toxicity
• modernize
• bombarded
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• cheese
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• passage

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• disappointed
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• satisfaction
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• aspect
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• reveal
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• tomato
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• dragon
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• peeping
• fake
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• saturday
• general
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• desensitizes
• deserters
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• designating
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• desirables
• desiring
• desisting
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• desolating
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• despairs
• desperadoes
• despising
• despoiling
• despoils
• despots
• dessertspoons
• destabilizing
• destabilizes
• destining
• destines
• detaching
• detaches
• detachments
• detaining
• detains
• detecting