great pressures have been put on world;s water resources and in turn people

great pressures have been put on world;s water resources and in turn people
great pressures have been put on world's water resources and in turn people are straining aquatic systems worldwide. 4552
想知道的语言点：
1—这里的put on怎么翻译
2—great pressures have been put on world's water resources .
翻译：大的压力被放到世界水资源上.翻译的怎么这么别扭.
3—aquatic systems worldwide 怎么翻译?世界范围的水资源?
补充：
1— in turn ：依次,轮流,反之,相反.
2—strain：拉进,劳累,过分使用.