至于选择何种触发方式，还要 依占空 比是固定的还是随意的来定。
The device may be triggered either automatically or manually and depending on how the device is triggered will also depend on whether the duty cycle is fixed or random.
ACC的总顾问苏珊·哈克特说，就在几年前，按她所称之为的“依值计费”方式付费的付费额只占协会成员单位法务开支的3%。
Susan Hackett, the ACC's general counsel, says that just a few years ago what she calls "value-based" billing was only 3% of her members' legal spending.
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