expedition [名詞]遠征、探検

1-C. However, the trip is only possible for a few weeks a year when the frozen ocean melts enough to allow expedition ships through.However, the trip is only possible for a few weeks a year when the frozen ocean melts enough to allow expedition ships through.  

しかし、旅行はだけ可能です、数週間の間ダヨ、年間でダヨ、いつかというと、凍結した海が十分に溶けるときダヨ、探検船を通すのを許容するだけダヨ。  

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