;
;Hold the ladder tightly and move up a rung at a time.
抓紧梯子一级一级地往上爬。
形公路
；对闭砂条；垫圈轧，锻锭纺纱形激光器，式激光器Hold the ladder tightly and move up a rung at a time.
抓紧梯子一级一级地往上爬。
Most of the workers had already rung in by the time I arrived.
到我来的时候为止, 大多数工人都已签到了。
Have you rung up your mother recently?
你最近给你妈妈打过电话吗?
I was rung up by an old friend this morning.
今天上午有个老朋友给我打电话。
To be safe you should go up a ladder one rung at a time.
为安全起见, 
梯子时你应该一步一步往上爬。
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