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sac  | 
        
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n. (生物)囊,液囊 pouch or pouch-like structure in a plant or an animal, sometimes filled with fluid The sac is filled with foam blocks that arrive all packed tight.  | 
        
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saddle  | 
        
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v. 鞍子,马鞍 load or burden; put harness onto animal's back to ride Rainy days happen, and your mother is wrong to saddle you with the risk.  | 
        
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sake  | 
        
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n. 缘故,原因 purpose; reason for wanting something done I could dare it for the sake of any friend who deserved my adherence, like you, I am sure, do.  | 
        
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salient  | 
        
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a. 显著的,突出的,卓越的 prominent or protruding; projecting outwardly; moving by leaps or springs One of the salient features of that newspaper is its excellent editorial page.  | 
        
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saline  | 
        
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a. 含盐的,咸的 salty; containing salt; of or relating to chemical salts You can purchase a saline solution in the drug store.  | 
        
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saliva  | 
        
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n. 口水,唾液 the liquid that is produced naturally in the mouth Even thinking the word made saliva grow thick against her tongue.  | 
        
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salmon  | 
        
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n. 鲑鱼 several species of fish of the Salmonidae family; reddish yellow or orange color, like the flesh of the salmon He planned to go fishing for salmon on Sunday.  | 
        
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saltiness  | 
        
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n. 盐度 property of containing salt A group of scientists predicted that the saltiness of the ocean's waters around South Africa could serve as an early indicator of climate change.  | 
        
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sample  | 
        
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n. 范例,样品 a small part of something intended as representative of the whole The World Health Organization says there is no guarantee that every virus sample can be traced and destroyed.  | 
        
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sandy  | 
        
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a. 沙的,多沙的 loose and large-grained with consistency There is lots of light sandy soil in this area.  | 
        
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sanitary  | 
        
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a. (有关)卫生的 relating to health or the protection of health They should pay attention to sanitary conditions for preparing food.  | 
        
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