Many scientists have therefore concluded that a sixth great mass extinction is currently in progress.

因此，许多科学家得出结论，第六次大规模物种灭绝正在发生。

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Therefore, the treatment of chronic hepatitis B is currently facing a difficult mission.

因此，治疗慢性病毒性乙型肝炎是我们当前所面临的一个艰巨使命。

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Therefore, the treatment of chronic hepatitis B is currently facing a difficult mission.

因此，治疗慢性病毒性乙型肝炎是我们当前所面临的一个艰巨使命。

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