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бесплатный сыр бывает только в мышеловке 强调
一般	one may make up a soft bed for sb., but still it will be hard to sleep in; one may make up a soft bed, but still it will be hard to sleep in; you may make up a soft bed for sb., but still it will be hard to sleep in; you may make up a soft bed, but still it will be hard to sleep in
说	the only free cheese is in the mousetrap (Alexander Oshis); free cheese is only found in the mousetrap (Alexander Oshis); there is no such thing as a free lunch; there is always free cheese in a mousetrap (Inchionette)