A step-down transformer has a turns ratio less than 1.

Methods step down test and step through test in mice were used.

方法:采用小鼠跳台法和避暗法.

It was she who guided my every step in the working-class movement.

是她在工人运动中指导我的每一步行动.

" No , " he said, " Carrie's out; but won't you step in?

“ 不在, " 他说, " 嘉莉出去了, 不过请进来好 吗 ?

Your paper marks a forward step in the research.

你的报告标志着研究工作的向前发展.

It marks a forward step in human progress.

这标志着人类发展的一次进步.

We must step in any matter that does not agree with principle.

我们必须干涉任何不符合原则的事情.

For once the step-mother had nothing to say.

这一次 继母 没话说了.

Tom's step-mother allowed him to eat so much in a day.

汤姆的 继母 一天内只允许他吃这么多.

I do not seem to be able to please my step-mother and Isable; more .

看来我没办法使 继母 和 伊莎贝尔 满意.

My step-mother always gives her son an advantage over me.

我的 继母 总是使他的儿子比我占优势.

Go to your step-mother and ask her to give you provisions for the journey.

去找你 继母,让她给你准备些东西路上吃.

I do not seem to be able to please my step-mother and Isabel ; more.

看来我没办法使 继母 和 伊莎贝尔 更满意.

She is afraid of her cruel step mother.

她害怕狠心的继母.

All would have been well with her but that she had a cruel step-mother .

要不是因为她有个狠心的 继母,她的一切本来都会挺好的.

Amy's pitiless step-mother refused to look after her when she was seriously ill.

艾米那个铁石心肠的 继母 在她生重病时不肯照料她.

The step-mother gave the boy the stick without any reason.

继母 无缘无故地打了那男孩一顿.

Such were the words of the step-mother .

这是 继母 的话.

We must step up our vigilance.

我们一定要提高警惕.

We should step up the development of infrastructure for research.

加强科学基础设施建设.

The teacher called Dabao to step up the platform.

老师叫大宝走上讲台.