@fartleksburpees @xuchuanmei @Gab_H_R "Ruled out" is the operative phrase here. You can't really rule out transmission on frozen packages. You can say you couldn't find virus on any of the packages you tested, or surfaces in the warehouse. But package there a week or two earlier wouldn't be any more.
@“排除”是这里的操作短语。你不能完全排除冷冻包裹的传播。你可以说在你测试的任何一个软件包上，或者在仓库的表面上都找不到病毒。但提前一两周到达那里的包裹再也没有了。