They said highly anxious rats which were kept had very low levels of a brain chemical called fibroblast growth factor 2 or PGF2, compared with rats that were more relaxed.
他们说保持大鼠高度紧张很低水平的一种大脑中的化学物质叫成纤维细胞生长因子2或PGF2老鼠，而对他们更加轻松了。
They said highly anxious rats which were kept had very low levels of a brain chemical called fibroblast growth factor 2 or PGF2, compared with rats that were more relaxed.
他们说保持大鼠高度紧张很低水平的一种大脑中的化学物质叫成纤维细胞生长因子2或PGF2老鼠，而对他们更加轻松了。
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