生态学家通常把外来物种定义为人们偶然或故意带到新地方的物种。

Ecologists generally define an alien species as one that people, accidentally or deliberately, carried to its new location.

youdao

顺便告诉你，那不是偶然的，根本就是故意的。

This is no accident by the way — it’s quite intentional.

youdao

旱季快要结束时，由人们故意燃起或者偶然点燃的山火遍布各地，这是（当地人）在清理或管理农田和居民区地面。

In the late dry season, fires—both intentional and accidental—become widespread as people turn to fire to clear and manage agricultural and residential landscapes.

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