During the half hour the advertisement was aired, a substantial portion of the viewing public tuned into the advertisement.

在广告播出的半小时内，相当一部分观众收听了广告。

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Another substantial portion of the debt consists of surpluses in the social security account.

另外一个债务的主要构成部分则由社保账户上的盈余构成。

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Since they are working on a contingency basis, they stand to gain a substantial portion of any damages.

由于这项工作是在应急基础上进行，那么原告就一定会受到大量损失。

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Facebook, meanwhile, the numbers make clear, gets a substantial portion of its revenue from Zynga.

FORBES: Zynga Makes Up 12% Of Facebook's 2011 Revenue

Prosecutors allege that Mr. Aleynikov transferred a substantial portion of that code to a computer server in Germany.

WSJ: In Fast-Trading Trial, Protection for Goldman Sachs Secrets

Wellstream derives a "substantial portion" of revenues from Brazil, where it operates one of its two manufacturing facilities.

FORBES: Magazine Article