80% of burglaries are committed by casual opportunists.
80%的入室行窃都是临时起意者所为。
《牛津词典》
2
Opportunists must constantly invade new areas to compensate for being displaced by more competitive species.
“机会主义者”必须不断入侵新的地区，以弥补被更具竞争力的物种取代的损失。
3
Human landscapes of lawns, fields, or flowerbeds provide settings with bare soil and a lack of competitors that are perfect habitats for colonization by opportunists.