求翻译：所以还是要依靠外部人员招聘。外部人员招聘时最有效、最直接地解决人员短缺的方法。同时，外部招募的人员来源广，选择余地很大，能招聘到许多优秀人才，尤其是一些稀缺的复合型人才。这样可以节省内部培训费用。可以有效的提高员工的效率。是什么意思？

So we should rely on external staff recruitment. External recruitment is the most effective and most direct solution to staff shortages. External recruits a wide source of great choice, be able to recruit many talents, especially some of the complex talent scarcity. This saves the cost of internal t