a boulder
boulder 是可数名词，用不定冠词 a/an 表示单数泛指。
A boulder blocked the narrow path.
一块巨石挡住了狭窄的小路。
抱石攀岩活动；大弹珠；大玻璃球；巨砾；漂砾；博尔德（美国科罗拉多州城市）；从周围土地上分离出来的大石块。
a large mass of rock detached from its surroundings; a large rock
从周围土地上分离出来的大石块。
A large mass of stone detached from the surrounding land.
从原产地分离出来的大块光滑岩石
a large smooth mass of rock detached from its place of origin
直径大于256毫米的颗粒,依据温特沃斯粒径分类。
A particle greater than 256 mm in diameter, following the Wentworth scale
科罗拉多州中北部的一个城镇；落基山度假中心和大学城
a town in north central Colorado; Rocky Mountains resort center and university town
儿童游戏中的大理石球。
A large marble, in children's games.
攀岩活动的一次练习；参与攀岩。
A session of bouldering; involvement in bouldering.
The hikers stopped to rest on a huge boulder beside the trail.
徒步者们停下来，在小径旁的一块巨石上休息。
用法提示：这里 boulder 作名词，指一块巨大的天然石头。
Heavy rain sent boulders rolling down the mountainside.
大雨使巨石沿山坡滚落下来。
用法提示：boulders 是 boulder 的复数形式，作名词，表示多块大石。
The climbers used ropes to get around the smooth boulder.
攀岩者用绳子绕过那块光滑的巨石。
用法提示：boulder 作名词，指攀岩者遇到的大块岩石。
boulder 是可数名词，用不定冠词 a/an 表示单数泛指。
A boulder blocked the narrow path.
一块巨石挡住了狭窄的小路。
定冠词 the 用于特指某块巨石。
The boulder was too heavy to move.
那块巨石太重了，搬不动。
复数形式 boulders 表示多个巨石，零冠词泛指时常用复数。
The river was full of smooth boulders.
河里布满了光滑的巨石。
grammar · medium
易错句子The river is full of boulder.
正确表达The river is full of boulders.
boulder 是可数名词，表示“巨石”。泛指多个时必须用复数形式 boulders。汉语名词没有单复数变化，容易漏掉词尾的 -s。
grammar · medium
易错句子Boulder is a large rock.
正确表达A boulder is a large rock.
用 boulder 泛指一类事物时，可数名词单数前必须加不定冠词 a/an。汉语习惯说“巨石是一种大岩石”，没有冠词，直译时容易漏掉 a。
grammar · medium
易错句子He picked up a boulder and put it in his pocket.
正确表达He picked up a stone and put it in his pocket.
boulder 特指从周围土地分离出来的大石块（粒径通常大于 256 毫米），体积很大，不可能放进口袋。表示小石子应用 stone 或 pebble。
巨大的巨石
A huge boulder blocked the path.
一块巨石挡住了小路。
巨石场；乱石滩
The trail crosses a boulder field.
小径穿过一片乱石滩。
布满巨石的
The slope was boulder-strewn.
山坡上布满巨石。
长满苔藓的巨石
He rested on a moss-covered boulder.
他坐在一块长满苔藓的巨石上休息。
滚动巨石
They tried to roll the boulder up the hill.
他们试图把巨石推上山。
冰川漂砾（由冰川搬运的巨石）
A glacial boulder sat in the middle of the field.
田野中央有一块冰川漂砾。
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