系统包括三个部分：原发肿瘤的扩散程度(t)；淋巴结的转移程度(N)和是否有了其他器官的转移(M)。

The system is based on the spread of the primary tumor (t), the extent of lymph node involvement (n), and the presence or absence of metastases (m).

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一次检查显示，他的肺部左下叶有一小块肿瘤，但尚未扩散。

A checkup revealed a small tumour on the left lower lobe of his lung, but it had not yet metastasized.

《柯林斯英汉双解大词典》

所幸的是肿瘤在扩散前就切除了。

Thankfully, the tumour was cut out before it spread.

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