center 指三维空间的中心点，也可比喻抽象事物的中心。
middle 一般指时间、空间或过程两端间等距的部分。
heart 指事物最内部或最重要的部分，表地理位置时可与center换用。
core 指某事物固定的中心部分或最重要的核心部分。比喻意义指某物的精华。
midst 书面语用词，指在一个群体的深处或在某活动的进程中。
参考例句
1. Brain Disease and Aging Research Center. 脑疾病暨老化研究中心“，”
2. Restaurant at the youth activity center. 青年活动中心的大餐厅。
3. Is the business center this way or that way? 去商业中心是走这条路还是那条路？
英英解释
n.
1. an area that is approximately central within some larger region
2. the piece of ground in the outfield directly ahead of the catcher
3. a building dedicated to a particular activity
4. a point equidistant from the ends of a line or the extremities of a figure
5. the choicest or most essential or most vital part of some idea or experience
6. the object upon which interest and attention focuses
7. a cluster of nerve cells governing a specific bodily process
8. the middle of a military or naval formation
9. (basketball) the person who plays center on a basketball team
10. (football) the person who plays center on the line of scrimmage and snaps the ball to the quarterbac
11. a place where some particular activity is concentrated
12. politically moderate persons; centrists
13. (ice hockey) the person who plays center on a hockey team
14. the sweet central portion of a piece of candy that is enclosed in chocolate or some other covering
15. mercantile establishment consisting of a carefully landscaped complex of shops representing leading
16. the position on a hockey team of the player who participates in the face off at the beginning of the
17. the position of the player on the line of scrimmage who puts the ball in play
18. a position on a basketball team of the player who participates in the jump that starts the game v.
1. center upon
2. direct one's attention on something
3. move into the center adj.
1. equally distant from the extremes
2. of or belonging to neither the right nor the left politically or intellectually
