Once the humus layer disappears, nutrients cannot be recycled and leach from the soil, converting soil from fertile to infertile and making it suitable only for savanna vegetation.
一旦腐殖质层消失，养分就无法从土壤中回收和过滤，致使土壤由肥沃变为贫瘠，只适于热带草原植被的生长。
If you wait for some time before running the lpstat command, you might not see the job, since it disappears from the queue once it is printed.
如果在运行lpstat命令前耽搁了一些时间，那么您可能看不到该作业，因为它一旦被打印就从队列中消失了。
Once the user logs in, you don't really want to see it anymore, so by default it disappears when it detects that an authenticated user is already present.
一旦用户登录成功，便不再想看到它了，所以当它检测到用户已经成功通过验证，它就按照默认设置变为不可见。
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