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Some butchers （屠夫）are not bakers（烘焙师）. No butchers are candlestick（烛台） makers. Therefore, some candlestick makers are not bakers.

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No one who is a Nobel Prize winner is a rock star. A number of astrophysicists （天体物理学家）are Nobel Prize winners. Therefore, a number of astrophysicists are not rock stars.

At least one lawyer is not a golfer. Only persons who have attended law school are lawyers. So, at least one person who has attended law school is not a golfer.

Only social scientists are political scientists. Many political scientists are persons who favor campaign finance reform. Accordingly, many persons who favor campaign finance reform are social scientists.

It is important that pregnant women and those with poor immune systems become aware of the potential risks posed by cats.Many of us keep cats as house pets without realising the dangers they may be harbouring.Cats are hosts to infectious toxoplasma gondii,a protozoa that causes disease,toxoplasmosis,in mammals such as humans.The protozoa is crescent-shaped and common in nature,but in its infectious stage relies on cats as host bodies.Adult humans rarely show signs of significant disease if they become infected.However,if pregnant women become infected,the foetus can become infected by parasites and suffer serious congenital damage.In the worst cases,infants may lose their eye-sight and acquire motor dificits.In people with poor immune systems or AIDS.toxoplasmosis can cause seizeures and death.The symptoms of the disease are not evident in cats so there is no way of knowing if a particular cat is a risk.孕妇和免疫能力差的人群需要知道养猫的潜在致病风险。许多人养猫，却不知道猫可能带来危险。猫的身上会寄生具有传染性的刚地弓形虫，是一种能导致哺乳动物（比如人类），患上弓形虫病的原生动物。这种原生动物是新月形的，在自然界很常见，但它具有传染性的生命阶段是寄宿在猫身上。成年人在感染后极少显示出严重病症。但是孕妇被感染的话，胎儿可能被寄生虫感染，致使认知能力遭受严重损害。最严重可能导致婴儿失明，兼有运动神经缺陷。免疫力低或患有艾滋病的人群若患有弓形虫病，可能导致癫痫和死亡。猫患此病的症状并不明显，所以无法得知某一只猫是否感染。