名词
中文翻译：Unknown
同义词：
['pebble', 'gravel', 'stone']
例句：
-
1. The riverbed is covered with smooth pebbles.
河床覆盖着光滑的小石子。
-
2. The old man used to collect gravel for his garden.
那位老人以前收集砾石来装饰他的花园。
-
3. The stones were arranged in a neat pattern on the floor.
地板上整齐地排列着石头。