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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
How long is this flight?
这趟飞行有多长时间？
He that climbs high falls heavily.
爬得高，跌得重。
but then she decided that at her age it might be more prudent to have someone with her,
但转念一想，像她这个年纪，最好找个人一起去。