评估柔韧性：屈体前伸测试。

Assess your flexibility: Sit-and-reach test.

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向体前将另一脚伸出，脚要伸直，与水平面成45角。

Hold the other foot out in front of you, leg straight at about 45 degrees.

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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)。

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

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