名词
中文翻译：Unknown
同义词：
['stone of progress', 'stepping-stone', 'stepping-off-stone']
例句：
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1. He found a stepping stone to cross the river.
他找到了过河的踏脚石。
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2. The company's new product is a stepping stone towards its goal.
公司的新产品是实现其目标的一个跳板。
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3. The old man used his walking stick as a stepping stone to reach the other side of the road.
老人用他的拐杖作为踏脚石，走到路的另一边。