The increased productivity from farmland made some countries self-sufficient in grain and livestock, and offered effective protection against famine.

农田生产力的提高使一些国家在粮食和牲畜方面能自给自足，并为防止饥荒提供了有效的保护。

Only 100% smoke-free environments provide effective protection.

只有100%的无烟环境可提供有效的保护。

Apitherapy effective protection of nuclear radiation-induced damage.

蜂疗能有效防护核辐射导致的伤害。

The system emphasizes engineering solutions; it provides reliable and effective protection.

这套系统强调工程师的处境，它提供可靠并有效的保护。

The causes of corrosion were analyzed and effective protection measures were presented.

针对这一现状，分析了腐蚀原因，提出了有效的防护措施。