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。
主句：More than three million doses were to be made available
介词短语：in early October 2009
从句：though most of those initial doses were of the FluMist nasal spray type
从句：which is not recommended
介词短语：for pregnant women, people over 50 or those
介词短语：with breathing difficulties, heart disease or several other problems
参考翻译：到2009年10月初，300多万剂疫苗就能投入使用，然而大多数的初期疫苗是喷鼻型的，不适合孕妇、50岁以上人群、呼吸障碍患者、心脏病患者以及患有其他疾病的人群。
