苏姗有时来看我，但是不很经常。

Susan comes to see me now and then but not very often.

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九月的天气经常也是热的，冬天的天气通常不很寒冷。

It is often hot in September, too. It usually is not very cold in winter.

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实验结果表明，由于光子计数器的核心器件光电倍增管及其高压电源不很稳定，光子计数器需要经常校验和标定。

Experimental results shows that the core device of the photon counter-PMT and it's high voltage power supply is not stable, the photon counter can be test and calibrated frequently.

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