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。
But once he's right up on it, it disappears from his vision.
但是，一旦他的权利了它，就会消失，从他的视野。
Once time is spent, it's gone forever. Once the sand slips through the hourglass, it disappears.
一旦时间被花费，它将再也不会回来；一旦沙子渗过沙漏，它将(永远)消失。
Breathe on a diamond. If the steam disappears at once, the diamond is real. If it stays for a few seconds, the diamond is forged.
在钻石上哈口气。如果钻石表面的水汽立即消失，则为真钻石。若停留几秒钟才消失的是假钻石。
Breathe on a diamond. If the steam disappears at once, the diamond is real. If it stays for a few seconds, the diamond is forged.
在钻石上哈口气。如果钻石表面的水汽立即消失，则为真钻石。若停留几秒钟才消失的是假钻石。
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