Studying female birdsong is no simple task.
研究雌性鸟鸣并不是简单的工作。
Meanwhile a separate study by King's College London researchers found being outdoors, seeing trees, hearing birdsong, looking at the sky, and feeling in contact with nature were associated with higher levels of mental wellbeing.
与此同时,伦敦国王学院研究人员在另一项研究中发现,户外活动、观赏树木、聆鸟鸣、仰望天空以及亲近自然,都与更高的的心理健康水平有关。