21. cook, cooker
cook廚師,cooker廚具 He is a good cook.
22. damage, damages
damage不可數(shù)名詞, 損害,損失; damages復數(shù)形式, 賠償金 $900 damages
23. police, policeman
police警察的總稱,后接復數(shù)謂語動詞,policeman 指某個具體的警察 The police are questioning everyone in the house.