给定如下Java代码片段：`int interface = 10; int _if = 20;`，关于这段代码，下列说法哪个是准确的？

A study indicates that a certain vaccine is effective in preventing a disease that can lead to severe complications, particularly in vulnerable populations. If the vaccination coverage in a region falls below the recommended threshold, what is the most likely consequence?

在Java中，以下代码片段可能会抛出哪种类型的异常？ String x = "abc"; int num = Integer.parseInt(x);

以下哪一项是衡量生产力发展水平的重要标志？

Which verb collocates most naturally with 'problems' in the context of finding solutions?