The principal activity of P2U is specializing in developing and formulating computer software, solutions, e-Commerce solution and systems.

的紧张活动P 2u是一家专业开辟和订定谋划机软件，办理方案，电子商务办理方案和系统。

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In many African countries, agriculture remains the principal economic activity, and agricultural products are the principal source of export trade.

在许多非洲国家，农业仍是主要的经济活动，农产品是主要的出口贸易产品。

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In many African countries, agriculture is the principal economic activity for 70% of the population.

在许多非洲国家，70%的人务农为生。

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Investment activity was the principal driver of fluctuations in the silver price in 2011, said the World Silver Survey.

FORBES: Silver Survey: Investment Key To Silver-Price Action In 2011; Mine Supply Hits Record High

From a regular elementary school, the principal cited many anecdotes of positive activity.

WHITEHOUSE: Not In My Backyard

Mr Esteves counters that principal investments, including proprietary trading and private-equity activity are only 15-20% of income, although this is still quite high by the newly chaste standards of Western firms.

ECONOMIST: Finance after the crisis: Pactual