25. man, a man

man人类;
a man一个男人 eg:Man will conquer nature.

26. chick, chicken

二者均可指小鸡;
chicken还可以当鸡肉 eg:The chicken is delicious.

27. telegram, telegraph

当电报解时，telegram指具体的;
telegraph指抽象的 eg:a telegram, by telegraph

28. trip, journey, travel, voyage

travel是最常用的;
trip指短期的旅途;
journey指稍长的旅途;
voyage指海上航行 eg:a three-day trip