他们生产优质刀片已经有400年历史了。They have been turning out great blades for 400 years.这些工具中很多都有锋利的刀片，务必小心。Many of these tools have sharp blades, so be careful.他用一次性刀片刮脸。He shaved himself with a disposable razor....
Cholelithiasis may be associated with present or past episodes of either acute or chronic cholecystitis.胆石症可能与现在和过去的急性或慢性的胆囊炎发作有关.Aim To explore the clinical characters of senile cholelithiasis and cholecystitis.目的探讨老年型胆...