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.