复数： breastbones

I had only mild symptoms at first : a slight pain below the breastbone when I swallowed , discomfort that felt like nerves or indigestion .

起初症状还比较轻，仅仅是吞咽时胸骨下方的微痛，类似那种神经紧张或消化不良引起的不适。

The t-cell precursors then go to the thymus , a small organ located under the breastbone , where they are called early thymic progenitors ( etps ) .

然后，t细胞的前体前往胸腺一个位于胸骨下的小器官，在那里，它们被叫做早期胸腺祖细胞（etps）。

Chakraborty and colleagues had previously developed computational models of t-cell development in the thymus , an organ located behind the breastbone through which t cells must pass in order to become mature killers .

chakraborty和他的同事曾经研究出t细胞在胸腺内发育的数学模型，t细胞必须在胸骨后的胸腺里发育后才能变成成熟的杀伤t细胞。

About the size of its owner 's clenched fist , the organ sits in the middle of the chest , behind the breastbone and between the lungs , in a moistened chamber that is protected all round by the rib cage .

大约人紧握的拳头般大小，心脏位于胸腔的中央，在胸骨之后两片肺叶之间，被包围着的胸腔保护着坐落在潮湿的腔室里。