In the case of an intermediate contract depth, the work to deepen the well would likely be done on a day-rate basis, or a "time and Materials" contract.
如果是中间点合同深度，则对井眼的加深作业可能采取日费合同或“时间和材料”合同。
2
According to one report, the water is advancing at a rate of between 8 and 10 inches a day.
根据一份报告，大水在以每天8至10英寸的速度逼近。
《柯林斯英汉双解大词典》
3
Car hijackings are running at a rate of nearly 50 a day.