adj. septennial
在美国，七年一次的旱涝周期循环，使一种由老鼠传播的肺汉滩川病毒在西南部猖獗起来。
In the United States, cycles of rain and drought seven years ago permitted a deadly form of pulmonary hantavirus, carried by mice, to flourish in the Southwest.
在第一次肾移植手术前，我已做了七年的透析。
I was on dialysis for seven years before my first transplant.
在同一个季度，公司公布了七年以来头一次的净损失。
During that same quarter, the company reported a net loss for the first time in seven years.
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