When filtering, the new E-mail was compared with four center vectors respectively to decide which class it belonged to.

过滤过程则将新进来的邮件分别与四个小类的类中心向量进行相似度比较，最终来判定所属类别。

youdao

When Winston is four years old, the foster family must return it to the training center.

温斯顿四岁的时候，寄养家庭必须把它送回培训中心。

youdao

Supplies began running low and early this week, five set off on foot across snow fields; on Friday, after four days of trudging, they reached a working military radio center.

供应开始减少，本周早些时候，五个人徒步穿越雪地；周五，经过四天的跋涉，他们到达了一个正在工作的军事无线电中心。

youdao

For the past four years, Al Wiman has organized a monthly science cafe for the Saint Louis Science Center in Missouri.

VOA: special.2010.05.14

This year's show in Santa Fe took place over four days in March at the city's convention center and nearby hotels.

VOA: special.2009.05.18

The four levels of rooms center on a beautiful courtyard with a glass ceiling to let light shine in.

VOA: special.2009.01.11

All four center on Adelson's exceedingly valuable concession, one of six casino concessions and subconcessions in Macau.

FORBES: Year of the Rat

The chart below includes a list of four shopping center REITs that have outperformed (based on latest fourth quarter 2011) and indicate an increasing health in overall fundamentals.

FORBES: REITs That Won't Kill You, Will Make You Stronger

E-Trade moved into asset management in February 1999 and set up a bond center four months later.

FORBES: After the Bubble