这位参议员回应说，反对派对环境问题的担忧是政治上的机会主义。
The senator responded by saying that the opposition's concern for the environment was political opportunism.
人工草坪、田野或花圃等人文景观提供了裸露的土壤和缺乏竞争者的环境，是“机会主义者”的完美殖民地。
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.
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