Time Based free trial -give a free trial for X days and start charging once the trial ends.
有时间限制的免费试用——提供给用户一个X天的免费试用期，在试用期结束之后开始收费。
Facebook has been trialling charging at its US operation since December. The trial has now been extended to a further 36 countries, including the UK.
从去年12月起，这项联系名人收费的业务已经从美国开始试点，目前已经推广到包括英国在内的36个国家。
Facebook has been trialling charging at its US operation since December. The trial has now been extended to a further 36 countries, including the UK.
从去年12月起，这项联系名人收费的业务已经从美国开始试点，目前已经推广到包括英国在内的36个国家。
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