The next activity in line is B which depends on Fact 1 and 3.
在线上的下一个活动是B，它依赖于事实1和3。
Plan B: Custom coding of an activity
B方案：一个活动的客户化编码
Stage B is "the first volcanic activity and biological hazard";
阶段为第一次火山活动和生物灾难事件；
Stage B is "the first volcanic activity and biological hazard";
阶段为第一次火山活动和生物灾难事件；
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