名词
中文翻译：Unknown
同义词：
['pebble', 'gravel', 'cobblestone例句：1. The river is lined with pebbles and gravel.（河岸边铺满了鹅卵石和砾石。）']
例句：
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1. The river is lined with pebbles and gravel.
河岸边铺满了鹅卵石和砾石。
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2.He picked up a few cobblestones to use as stepping stones.
他捡了一些鹅卵石作为踏脚石。
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3.The trail was littered with small pebbles and cobblestones.
小石子和小石块遍布在小径上。