1. If left unchecked, weeds will flourish. 如果不加遏制,杂草就会疯长。
2. The fire was allowed to burn unchecked. 大火肆虐,不受控制。
3. The rise in violent crime must not go unchecked. 暴力犯罪的增长必须加以制止。
4. The plant will soon choke ponds and waterways if left unchecked. 如不控制这种植物的生长,池塘和水道很快就要被阻塞。
5. If such practices are unchecked, half the species in the Coral triangle will continue to disappear at a rate of 1-2% a year. 如果这些行为不加以制止,那么珊瑚三角区内一半的物种将以每年1-2%的速度继续消亡。