者 One of the volunteers died in the fight against the great flood.在抗洪斗争中有一个志愿者牺牲了。 v. offer to do something without pay or reward甘愿 She volunteered to clean the room.她主动打扫房间。 arithmetic n. U the science of numbers; the adding, dividing,etc. of numbers算术 He teaches arithmetic in that middle school.他在那个 中学教算术。 a. of or concerning arithmetic算术的 The pupils are taking an arithmetic test..学生正在进行 算术考试。volunteer n. a person who offers to do something 志愿 者 One of the volunteers died in the fight against the great flood. 在抗洪斗争中有一个志愿者牺牲了。 v. offer to do something without pay or reward 甘愿 She volunteered to clean the room. 她主动打扫房间。 arithmetic n. [U] the science of numbers; the adding, dividing, etc. of numbers算术 He teaches arithmetic in that middle school. 他在那个 中学教算术。 a. of or concerning arithmetic算术的 The pupils are taking an arithmetic test. 学生正在进行 算术考试