The exchange of material culture is bilateral.

物质文化的交流是双向的。

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The host, whether it is a person, bird, or pig, provides a place for influenzas to make contact, exchange genetic material, and form new viruses.

无论是人、鸟还是猪，作为宿主都能为流感病毒提供接触、交换遗传物质和形成新病毒的场所。

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The current winter season gives influenza viruses an opportunity to inter-mingle and possibly exchange their genetic material in unpredictable ways.

此一冬季使流感病毒有机会混合，并有可能以难以预测的方式交换其遗传物质。

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The amendment makes it a crime for anyone to deploy peer-to-peer technology that facilitates the exchange of copyrighted material online.

VOA: standard.2009.04.23

Typically these are created when two existing strains infecting an animal such as a bird or a pig exchange genetic material.

BBC: La Nina 'linked' to flu pandemics

File-exchange sites like Gnutella and Hotline, which act as matchmakers for people who want to exchange movies and other copyrighted material, aren't nearly as easy to use as the popular music-exchange program Napster.

CNN: Studios hope to prevent a movie 'Napster' from taking hold

In addition, the Securities and Exchange Commission must expand its disclosure requirements to include material non-financial concerns of the type described above.

CENTERFORSECURITYPOLICY: Center For Security Policy