The homework portion of your total grade is the aggregate of all of those weekly test scores.

你们总分中家庭作业的部分,则是这些每周测试的分数的总和。

麻省理工公开课 - 固态化学导论课程节选

They decided, for instance, to test a portion of a company's internal controls each year, not all of them.

ECONOMIST: Auditors

In my own community, there was an instance just this year where students had managed to photograph a portion of a statewide test with their cell phone, and attempt to pass it along.

FORBES: CNBC Exposes Cheating In America

She noted that 88 percent of third-graders passed the reading portion of the state assessment test this year, up from 76 percent in 1994.

CNN: By Karen Spiller/The Telegraph of Nashua