Effective treatment for these conditions is critically dependent on therapeutic sera1, but this essential drug is often unavailable or unaffordable in the countries where it is most needed.

在这种情况下的有效治疗主要依靠治疗血清1，但在需求最大的国家中，常常不能获得这种基本药物或支付不起其费用。

youdao

Although it is concise, the RDL language allows you to express a number of essential concepts used in model transformation (for example, correspondences, expressions, and conditions).

RDL语言尽管很简洁，却使你能够表达很多模型转换中使用的关键概念(比如，通讯，表达式，以及条件)。

youdao

He points to the removal of conditions related to land reform from the IMF package in Ukraine because, though useful, they were not essential for macroeconomic stabilisation.

他指出组织在乌克兰将土地改革排除在贷款条件外，原因是它对宏观经济的稳定没有起到多大的作用。

youdao

Courageous, clever and honest, he tried under difficult conditions to bring in essential reforms and prepare the country for the euro.

ECONOMIST: Those mutinous French

In Scotland, police have advised drivers to take care in the wintry conditions and only make essential journeys.

BBC: Traffic jam

But they had evolved a chivalric code, which, by giving meaning to their lives and preventing them from succumbing to despair in these harsh conditions, performed the essential function of religion.

NPR: Armstrong, 'Muhammad: A Prophet for Our Time'