贵国使用了多少环境指标说明国家环境状况的趋势？
How many environmental indicators are used to describe trends in the state of your country's environment?
通过这些指标说明干旱是关中灌区难以实现稳产、高产最大的障碍。
Drought is the biggest disturbance of dependable crop and heavy-producing grain output to the irrigation district.
“只用一个指标不足以说明这是怎么回事，”他说。
"No single indicator would be adequate to describe what's going on," he says.
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