Fly neither too high nor too low was his advice.
不要飞得太高，也不要飞得太低，他建议道。
The difficulty lies on keeping the amplitude in a proper range to activate the primary instrument, neither too high nor too low.
驱动设计的难点在于必须保持激振信号幅度在合适的范围内，过大过小都不能驱动一次仪表正常工作。
The difficulty lies on keeping the amplitude in a proper range to activate the primary instrument, neither too high nor too low.
驱动设计的难点在于必须保持激振信号幅度在合适的范围内，过大过小都不能驱动一次仪表正常工作。
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