bumble been
熊是
以上为机器翻译结果，长、整句建议使用 人工翻译 。
"One of the main reasons bumble bees have been declining over the last 70, 80 years has been changes in the landscape, " explains Dawn Ewing, outreach manager of the Bumblebee Conservation Trust.
BBC: Making a bee-line for city roofs
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