It is an efficient obstacle to material exchange and avoids the skin's drying out.

它是物质交换的有效阻隔并防止皮肤干燥。

youdao

The Drum Pump offers a simplified material exchange, prevents sealant loss due to leaking and helps to maintain a clean workplace.

转子泵提供了简化的物质交换，防止了由于泄露而造成的密封剂损失，有助于保持清洁的工作环境。

youdao

Between the reservoir system and the external environment the constant material exchange makes the dynamic reservoir system more complex.

油藏系统与外界不断地进行物质交换，造成油藏动态系统更加复杂化。

youdao

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

That is, they produce a stream of electrons (electricity) by forcing two bits of charged material, say nickel and cadmium, to exchange electrons.

FORBES: Running in place