The reduction step of catalyst with butene-2 and reoxidation step of reduced catalyst with oxygen were investigated by the pulse method.

用脉冲法研究了催化剂用丁烯- 2还原及还原催化剂用氧再氧化步骤。

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There has been no loss, but the possible effect of a loss has been anticipated and the pre-loss risk reduction step of wearing a belt has been taken.

这就是进行了风险预测，然后采取了系安全带的防灾举措。预测了可能发生的损失，系上安全带就是采取了损失控制措施。

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BARACK OBAMA: "This compromise guarantees more than two trillion dollars in deficit reduction." It's an important first step to ensuring that as a nation, we live within our means.

奥巴马：“这一妥协协议保证了削减2万多亿美元赤字，这是确保美国能够实现“量入为出”迈出的重要的第一步。”

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Analysts and airline industry officials say the fee reduction is a step in the right direction, but it fails to address the largest burden on the industry: high fuels costs and taxes.

WSJ: India Moving to Reduce Airport Fees

Mr Bush's trade supremo, Robert Zoellick, and the commerce secretary, Don Evans, presented the new plan as the logical culmination of the step-by-step reduction of trade tariffs that has taken place since the end of the second world war.

ECONOMIST: Can America kickstart the Doha round? | The

That would be a symbolic first step towards an eventual reduction in Western troop numbers.

ECONOMIST: Afghanistan: Fearful asymmetry | The