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- African elephants only have four teeth to chew their food with. However, each tooth is 12 inches long, and their tusks are elongated teeth that grow throughout their lives, like fingernails. 非洲象只有四只牙齿用以咀嚼食物，但是每只牙长达12英寸，而且尖尖的象牙是延长的牙齿，就像指甲一样终生生长。
- African elephants only have four teeth to chew their food with. However,each tooth is 12 inches long,and their tusks are elongated teeth that grow throughout their lives,like fingernails. 非洲象只有四只牙齿用以咀嚼食物，但是每只牙长达12英寸，而且尖尖的象牙是延长的牙齿，就像指甲一样终生生长。
- Now my baby is seven months old, and she is growing faster than other babies. She has four teeth and likes to talk. She seems very understanding. 现在的她已七个月大,发育都比别人快,长了四颗牙,叽叽喳喳很喜欢说话,感觉上她似乎很懂事。
- "Four teeth show signs of decay associated with the hole, indicating that the intervention in some cases could have been therapeutic or palliative," he added. 在这9名成年人遗骨中，有4名女性、两名男性，另外3人无法确定性别。科研小组发现，他们一共有11个牙齿被钻了孔。其中一个人的3颗牙齿上有钻孔，另外一个人的一颗牙齿还被钻了两次。
- It is clear to all of us that two plus two is four. 二加二等于四对我们大家都很清楚。
- He wove four plots together into a novel. 他把四条情节编成一部小说。
- We have tea at four o'clock in the afternoon. 我们在下午四点钟喝茶。
- The town boasts four swimming pools. 这座城镇以拥有四个游泳池而自豪。
- Our football team won by four goals to nil. 我们的足球队以四比零取胜。
- He lay back and hit the ball for four. 他向后弯身击中球，得了4分。
- I was clean broke in less than four days. 不到四天我就一个钱也没有了。
- I'll look out for you at about four. 我4点钟左右找你。
- He showed us four case studies of disturbed girls. 他给我们看了4位精神失常姑娘的病历。
- My house is four miles distance from the sea. 我家离海四英里。
- Our team beat them hollow by four clear goals. 我们队以净胜4分彻底击败了他们。
- The leap year comes around once in four years. 每四年有一个闰年。
- The soldiers counted off from the left by four. 士兵们从左起四个一组大声报数。
- He wooed four girls before finally marrying one. 他在结婚之前曾向四个姑娘求过婚。
- Four avenues radiate from the square. 四条林荫大道从那广场向四方延伸。
- There are four verses in each poem. 每首诗有四个诗节。
