在一些特殊场合对金属硬密封蝶阀的密封提出了更高的要求，必须双向承压。
In some special occasions for metal hard seal butterfly valve seal put forward higher request, must be two-way under pressure.
你经常化妆吗？你经常用香水吗？为什么？在一些特殊场合我就会化妆、用香水，比如…
Do you always wear makeup? Do you always wear perfume? Why? I wear makeup, perfume on some special occasions.
在一些特殊的场合，测量甚至是唯一的方法。
在一些特殊的场合，他们就在我们周围。
They do surround us on special occasions to come in photos as they would have in life.
因此，在一些特殊及精度要求不高的场合，由只根据采样电流、电压等易测量，通过特定方法估算转子位置和转速的无位置传感器控制策略将得到广泛应用。
Thus, sensorless control strategy which only according the sampling of the current and voltage to estimate the rotor position and speed by specific methods will be widely applied.
因此，在一些特殊及精度要求不高的场合，由只根据采样电流、电压等易测量，通过特定方法估算转子位置和转速的无位置传感器控制策略将得到广泛应用。
Thus, sensorless control strategy which only according the sampling of the current and voltage to estimate the rotor position and speed by specific methods will be widely applied.
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