Whales and dolphins are marine mammals.鲸和海豚都是海洋哺乳动物。

marvelous adj.不可思议的；了不起的

The weather was marvelous for an afternoon walk in the park.天气非常适合下午去公园散步。

massive adj.大而重的，庞大的；可观的

If the drought continues, deaths will occur on a massive scale.如果十旱继续，将会发生大规模死亡。

match n.相配的人（或物）

We talked about their love and hopes, and we all agreed that it was a good match.我们谈论了他们的爱与希望，大家都认为他们俩很相配。

I’ve been unable to match this coat with any of my dresses.我一直没法把这件外套与我的其他裙子进行搭配。

mate v.(使）结伴，（使）成配偶

The zoo bought a new male gorilla to mate with the female one.动物园新买了一只雄性大猩猩，与雌性大猩猩配成一对。

A male goose has only one mate until he dies.公鹅一生只有一个伴侣。

mature adj.（智力或体力）成熟的

Young girls are often more mature than young boys.小女孩通常比小男孩更成熟。

maximum n./adj.最大置（的），最大限度（的）

The maximum amount of time I can give you is 2 weeks.我最多能给你两周时间。

mean adj.卑鄙的,吝啬的；平均的

She’s very mean and never shares her sweets.她非常小气，从不跟其他人分享她的糖果。

Six is the mean number between three and nine.六是三和九的平均数。

mechanism n.机械（装置)；机理；运作机制

An automobile engine is a complicated mechanism,汽车引擎是一种非常复杂的机械装置。

media n.媒体

The media are interested in focusing on controversial matters.媒体有兴趣关注争议性事件。