Thirteen percent watch TV four to six times a week.

13%的人每周看电视四到六次。

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The service was for the thirteen people killed in a shooting there last week.

VOA: special.2009.11.14

He worked on one per week for thirteen weeks, then started over, four times a year.

FORBES: Level 5 Time Management: Beyond Stephen R. Covey and Ben Franklin

This holiday shortened thirteen trading week of 2013 comes to a close with investors sending stocks higher.

FORBES: Weekly Wrap

In a University of California survey, students reported spending thirteen hours a week on schoolwork and forty-three hours socializing and pursuing various forms of entertainment.

NEWYORKER: Live and Learn