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vi. 【生物学、医学】血清转化, 对疫苗产生抗体
🗣️ 情景例句
I'm in great need of your assistance.
我特别需要您的帮助。
I was just about to call you.
我正准备打电话给你。
I'm afraid that it's not going to work out.
我恐怕这事不会成的。