At the height of 8,000 meters, there is only 30% O₂ and the human body can only stand this height for a few days, so it is dangerous for humans to climb higher.

在8000米的高度，只有30%的氧气，人体只能处于这个高度仅几天，所以人类再往上爬是危险的。

youdao

For example, the pattern o {2} would match two (and only two) o characters.

例如，模式o{2}将匹配两个(仅仅两个)o字符。

youdao

O(log n) behavior is measurably slower, but only marginally for very large task counts.

O(log n) 行为具有可测量的延迟，但是对于较大的任务数无关紧要。

youdao

Shane Geragthy levelled with a penalty, only for O'Gara to put Munster six clear with two more penalties.

BBC: Munster 12-9 Northampton

The wing forced his way past Mafi only for O'Leary's superb covering tackle to force Vaughton into touch just short.

BBC: Ospreys 21-25 Munster

Geragthy finally brought the visitors level on 53 minutes with a penalty in front of the posts, only for O'Gara to restore Munster's lead with a penalty four minutes later.

BBC: Munster 12-9 Northampton