Immunogen
n. 免疫原
??? 情景例句
OK.
好。
I'm young.
我很年輕。
Even under a clear blue sky, the village looked forbidding, as all the houses were built of grey mud bricks.
農舍全用灰色的土坯建成，因此，即使在晴朗的藍天底下，村莊看上去也會令人感到難以親近。