过敏原

例句：

1. 1. The doctor advised me to avoid the pollen from this tree as it can cause allergies.
   医生建议我避免这种树的花粉，因为它会引起过敏。
2. 2. Many people are sensitive to peanuts and nuts, which are common allergens.
   许多人对花生和坚果过敏，这些都是常见的过敏原。
3. 3. Allergies can be triggered by a variety of substances, including pollen, dust, and mold spores.
   过敏反应可以由多种物质触发，包括花粉、灰尘和霉菌孢子。