Whether it has other complications or not needs to be studied further.

是否有其他并发症有待于进一步观察。

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The mechanism of its inducing protective immunity needs to be studied further.

其诱导保护性免疫的机制尚待进一步研究。

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The mechanism of its inducing protective immunity needs to be studied further.

其诱导保护性免疫的机制尚待进一步研究。

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