eight + plural noun
eight 放在复数可数名词前表示数量，名词本身用复数形式，eight 不加 -s。
There are eight chairs in the room.
房间里有八把椅子。
八点钟；八点的纸牌；八人赛艇；赛艇的八名桨手；八人画派
the number 8; the digit 8
数字8
The digit/figure 8.
七加一所得的基数
the cardinal number that is the sum of seven and one
一副普通牌中值为八的四张牌之一
Any of the four cards in a normal deck with the value eight.
1907 年成立的美国画家团体,以真实描绘城市生活的阴暗面著称
a group of United States painters founded in 1907 and noted for their realistic depictions of sordid aspects of city life
一种轻便狭长的赛艇,尤其用于比赛,由舵手操控,八名划手各持两桨
A light, narrow rowing boat, especially one used in competitive rowing, steered by a cox, in which eight rowers each have two oars.
一副牌中正面有八个点数的四张牌之一
one of four playing cards in a deck with eight pips on the face
划赛艇的八名船员
The eight people who crew a rowing-boat.
八点钟
Eight o'clock.
The number eight is my lucky number.
数字八是我的幸运数字。
用法提示：eight 在此为名词，表示数字 8。
Please write an eight at the top of your paper.
请在纸的顶部写一个8。
用法提示：eight 在此作名词，指数字 8 的写法。
He counted to eight and then raised his hand.
他数到八，然后举起了手。
用法提示：eight 在此为名词，用于计数。
eight 放在复数可数名词前表示数量，名词本身用复数形式，eight 不加 -s。
There are eight chairs in the room.
房间里有八把椅子。
表示某个整体中的八个时，用 eight of 加限定词再加复数名词。
Eight of the thirty students failed the test.
三十名学生中有八人没通过考试。
表示钟点时用介词 at，也可以说 at eight o'clock。
The meeting begins at eight.
会议八点开始。
grammar · medium
易错句子I have eight years old.
正确表达I am eight years old.
表示年龄时英语用 be 动词加数字加 years old，即“主语 + be + 数字 + years old”，不能用 have。汉语“我八岁”没有动词，容易误加 have。
grammar · medium
易错句子My eight birthday is next week.
正确表达My eighth birthday is next week.
表示“第八个”要用序数词 eighth，不能用基数词 eight。“我八岁生日/第八个生日”指的是顺序，须用序数词。
grammar · medium
易错句子There are eight hundreds students in the hall.
正确表达There are eight hundred students in the hall.
hundred 前有具体数字时用单数形式 hundred，不加 -s；只有表示概数时才用 hundreds of，如 hundreds of students。
八点钟
The meeting starts at eight o'clock.
会议八点钟开始。
八岁
My son is eight years old.
我儿子八岁了。
8字形；八字形
The skater traced a figure of eight on the ice.
滑冰者在冰面上划出一个8字形。
8号；八号
He wears the number eight shirt for his club.
他在俱乐部穿8号球衣。
处于不利境地；陷入困境
Without a car, I'm behind the eight ball in this city.
没有车，我在这座城市里总是处于不利境地。
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