In 10 of the 12 countries studied, current pre-service training is insufficient to maintain the existing density of health workers once all causes of attrition are taken into account.
考虑到所有人员耗损的因素，在12个被研究的国家中，有10个国家的当前岗前培训不足以维持现有的卫生工作者的密度。
The plastic pollution on the sea has been studied all over the world, especially in developed countries.
世界各国，特别是发达国家，已对海洋的塑料污染问题进行了广泛研究。
Land use planning had been paid highly attention and studied largely by all the countries, as well as all kinds of organizations including FAO for a long term.
长期以来，世界各国和联合国粮农组织都高度重视土地利用规划，并进行了大量的研究。
应用推荐