鸡只不会在同一日龄对免疫有应答。
Not all chicks were capable of responding to vaccination at the same age.
youdao
这可能是因为有一个声音，应答机或调制解调器的答案。
This may be because there was a voice, answering machine or modem answer .
很难估量有多少人会应答。
It was difficult to gauge how people would respond.
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