1000句突破语音471-475

471. The sweater is of good quality.这件毛衣质地很好。
472. The teacher got a little angry． 老师有点生气了。
473. Think carefully before you act． 三思而后行。
474. Walt invented the steam engine． 瓦特发明了蒸汽机。
475. We are divided in our opinions． 我们意见分歧。