请根据NPC分析法拆分下列句子并进行翻译
例子：It remains to be seen how weather conditions affect the air flows that make formation flight more efficient.
主句：It remains to be seen
从句：how weather conditions affect the air flow
从句：that make formation flight more efficient
参考翻译：现在仍需考虑天气情况是如何影响气流的，因为气流关系到编队飞行的效率。
These are the kind of workers that countries like Britain, Canada and Australia try to attract by using immigration rules that privilege college graduates.
