chalk :名词 n.1.白垩[U]2.粉笔[C][U]Teachers usually write on the blackboard with chalk.教师通常用粉笔在黑板上书写.3.用粉笔划的记号及物动词 vt.1.用粉笔写(或画)[(+on/up)]2.用白垩粉擦;使变白3.画出...的草...