Where 50-kilogram king salmon once fought their way up waterfalls to lay their eggs in gravel beds, there now are only concrete walls holding back still water and deep beds of muddy deposits.
50公斤重的大马哈鱼王曾经奋力爬上瀑布，把卵产在砾石床上，现在只有混凝土墙挡住静止的水和深深的泥床。
Removing the mud, uncovering gravel beds where fish spawn, and finding suitable salmon types to rebuild the population is a daunting task.
清除淤泥，发现鱼类产卵的砾石层，找到合适的鲑鱼种类来重建种群是一项艰巨的任务。
The ancient gravel beds in the suburbs of Nanjng is one of the important types of rock of the Cenozoic era.
南京附近的古砾石层是组成该区新生代地层重要岩石类型之一。
The cool, clear waters with loose gravel beds hold some 2, 000 bull trout nests, among the highest concentration in the world.
凉爽清澈的河水，还有松散的碎石河床拥有2000外欧鳟巢穴，是世界上欧鳟巢穴最密集的地方。
The cool, clear waters with loose gravel beds hold some 2,000 bull trout nests, among the highest concentration in the world.
凉爽清澈的河水，还有松散的碎石河床拥有2000外欧鳟巢穴，是世界上欧鳟巢穴最密集的地方。
The geological features imply that the deposit has obvious stratabound characters, the ore bodies are mostly controlled by faults in gravel beds.
矿床地质特征反映该矿床具有明显的层控特点，矿体主要受砾岩层中的断裂控制；矿床成矿物质主要为深部来源，成矿作用受岩浆活动制约明显。
Whenever they heard his tires crunch on the gravel driveway they would scramble to hide under their beds.
只要一听到他的轮胎碾过车道上的碎石路他们就会赶紧爬到他们的床下躲起来。
Whenever they heard his tires crunch on the gravel driveway they would scramble to hide under their beds.
只要一听到他的轮胎碾过车道上的碎石路他们就会赶紧爬到他们的床下躲起来。
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