adj. gratuitous
那是因为母亲对儿女的操劳是无代价的。
That is because the mother of sons and daughters of toil there is no price.
无远见的政策使我们现在不可避免地要为气候变化付出代价。
Climate change is the price we will now inevitably pay for short-sighted policies.
这一转变的发生看似是以那些将自己描述为无信仰者（比例的下降）为代价的；
This turnaround seems to have come at the expense of those who describe themselves as being without religion.
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