house martins return to our village every spring to build their mud nests under the eaves.
燕子每年春天飞回我们村庄，在屋檐下筑泥巢。
we watched the housemartins diligently collecting mud for their nests near the pond.
我们观察到燕子正在池塘边勤奋地收集泥土筑巢。
the colony of housemartins returns to the old church building every year without fail.
这群燕子每年都会准时飞回那座古老教堂建筑。
housemartins are easily recognized by their glossy dark plumage and forked tails.
燕子很容易辨认，它们有着光滑的深色羽毛和分叉的尾巴。
the arrival of housemartins signals that summer is approaching in the countryside.
燕子的到来预示着乡村夏天即将来临。
housemartins dart through the air with remarkable agility catching flying insects.
燕子在空中灵活地穿梭，捕食飞行的昆虫。
these migratory birds travel thousands of kilometers to spend the winter in warmer regions.
这些候鸟飞行数千公里前往温暖的地区过冬。
conservationists are concerned about the declining population of housemartins in europe.
环保人士对欧洲燕子数量下降表示担忧。
housemartins often return to the exact same nesting sites year after year.
燕子通常每年都会回到完全相同的筑巢地点。
the cheerful chirping of housemartins fills the early morning air around our home.
清晨，燕子的欢快鸣叫声在我们家周围回荡。
farmers welcome housemartins because they consume large numbers of harmful insects.
农民欢迎燕子，因为它们捕食大量害虫。
housemartins build their characteristic cup-shaped nests using mud pellets and grass.
燕子用泥丸和草建造它们特有的杯状巢穴。
house martins return to our village every spring to build their mud nests under the eaves.
燕子每年春天飞回我们村庄，在屋檐下筑泥巢。
we watched the housemartins diligently collecting mud for their nests near the pond.
我们观察到燕子正在池塘边勤奋地收集泥土筑巢。
the colony of housemartins returns to the old church building every year without fail.
这群燕子每年都会准时飞回那座古老教堂建筑。
housemartins are easily recognized by their glossy dark plumage and forked tails.
燕子很容易辨认，它们有着光滑的深色羽毛和分叉的尾巴。
the arrival of housemartins signals that summer is approaching in the countryside.
燕子的到来预示着乡村夏天即将来临。
housemartins dart through the air with remarkable agility catching flying insects.
燕子在空中灵活地穿梭，捕食飞行的昆虫。
these migratory birds travel thousands of kilometers to spend the winter in warmer regions.
这些候鸟飞行数千公里前往温暖的地区过冬。
conservationists are concerned about the declining population of housemartins in europe.
环保人士对欧洲燕子数量下降表示担忧。
housemartins often return to the exact same nesting sites year after year.
燕子通常每年都会回到完全相同的筑巢地点。
the cheerful chirping of housemartins fills the early morning air around our home.
清晨，燕子的欢快鸣叫声在我们家周围回荡。
farmers welcome housemartins because they consume large numbers of harmful insects.
农民欢迎燕子，因为它们捕食大量害虫。
housemartins build their characteristic cup-shaped nests using mud pellets and grass.
燕子用泥丸和草建造它们特有的杯状巢穴。
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