usy___busiest
popular___the most popular
famous__the most famous
young__youngest
safe__safest
fast__fastest
far__furthest
old__oldest
long__longest
汉译英!
这是世界上最快的火车
this is the fastest train in the world＿＿＿＿＿＿＿＿＿＿
同样的路程,乘公共汽车回花50分钟的时间．
it will take 50 mins by bus to ride the same trip＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿
这是世界上最著名的渡口
this is the most famous harbor in the world＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿
最受欢迎的飞机是波音747．
the most popular aircraft is Boeing 747 ＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿