在使用前请确保校准血压计以获得准确读数。

Make sure to ___calibrate the blood pressure monitor before use for accurate readings.

工程师正在校准机器以确保测量精度。

The engineer is ___calibrating the machine to ensure measurement accuracy.

工程师校准了仪器以确保测量数据的准确性。

The engineers ___calibrate the equipment to ensure the accuracy of the measurements.