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Railways
The means of conveyance of passengers and goods by way of wheeled vehicles running on rail tracks.
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二次免疫
Biology; Cell biology
抗抗原它出現的第二次。因為 B 和 T 記憶細胞存在的 產生于抗原 Þrst 曝光期間,第二個反應更快、 更大規模和持續時間比主的免疫反應。 ...