每一个不积极投入救火的人都应离开该区域。
Everyone not actively engaged in the fighting of the fire should leave the area.
猛虎组织阻止15万居民离开该区域，救援机构对这些居民的安全问题高度关注。
Aid agencies continued to express concern about the safety of as many as 150, 000 civilians prevented from leaving by the Tigers.
固定y的值，那么从哪里进入该区域，又从哪里离开呢？
OK, so if we fix y, well, where do we enter the region, and where do we leave it?
应用推荐