动词 chalk:

1. write, draw, or trace with chalk

chalkn.粉笔；白垩v.用粉笔写；记录；使变白；归咎chalkogenides硫属化物chalky enamel无光搪瓷chalkostibite硫铜锑矿chalk whiting碳酸钙chalk masking粉化变色chalk drawing粉笔画chalk-plantn.丝石竹属chalk mixture[医] 白垩合剂chalking paint粉化涂料Chalk's bottle恰布基阿尼

1. Our school contracted with the nearest shop for50 boxes of chalk a month.
   我们学校同最近的一家商店每月订购50盒粉笔。