The mountain pine beetle is one step closer to crossing North America and turning eastern pine forests into the same bleak landscapes that have scarred the Mountain West in recent years.
山松甲虫距离穿越北美大陆又近了一步，同时也使得东部的松林，呈现出与近些年来的西山一样的满目疮痍的凄凉景象。
The mountain pine beetle is one step closer to crossing North America and turning eastern pine forests into the same bleak landscapes that have scarred the Mountain West in recent years.
山松甲虫距离穿越北美大陆又近了一步，同时也使得东部的松林，呈现出与近些年来的西山一样的满目疮痍的凄凉景象。
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