When hay fever first occurs it is often mistaken for a summer cold.
花粉病刚发作时，常会被误认为是热伤风。
This is called " heat lightning " because it occurs most often in the summer.
这被称为“热闪电”，因为它最常发生在夏季。
It occurs more often in women than in men.
此事更经常发生在女性身上，较少地发生在男性身上。
The geological hazard less exists alone. It often occurs in a group or family.
地质灾害很少单独发生，而常呈某种特定的群、族集体存在。
The geological hazard less exists alone. It often occurs in a group or family.
地质灾害很少单独发生，而常呈某种特定的群、族集体存在。
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