开花的柳树和杨树产生的杨柳飞絮每年会导致许多人产生过敏症状，并引发呼吸系统疾病。杨柳絮还会降低城市道路的能见度。
Fluffy catkins, from blooming willows and poplars, are an annual annoyance for many people who suffer from allergies and respiratory diseases. They also reduce visibility on city roads.
开花的柳树和杨树产生的杨柳飞絮每年会导致许多人产生过敏症状，并引发呼吸系统疾病。
Fluffy catkins, from blooming willows and poplars, are an annual annoyance for many people who suffer from allergies and respiratory diseases.
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