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。

youdao

These enzymes are used to"snip apart" plasmids at very specific DNA sequences, leaving free ends that can be rejoined as the scientist chooses.

这些酶被用来把特定的DNA序列中的原生质切断，切断后的原生质可以被科学家们自由地重新连接。

youdao

The free offer ends 31 October.

10月31日结束免费提供。

youdao

So, when the mortgage ends, you're just clear and free; you don't have to pay anything--nothing comes at the end.

因此,抵押贷款正好在到期时全部还清,贷款期末你不再偿还任何金额

耶鲁公开课 - 金融市场课程节选

Vice President Suleiman is in charge of a process in representing the Egyptian government to negotiate with those not in government in order to get us on a path toward an orderly transition that ends in a free and fair election.

WHITEHOUSE: Press Briefing

Looking to shorten the insight cycle, the company promises most customers will begin to see value from using the software before the 30-day free trial ends.

FORBES: Will Data Science Become the New Bottleneck?

The exhibition is free and ends on 20 May.

BBC: Things to do in South Yorkshire