We will first ascertain the cause of the disaster.
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まず， 先ず
1. first (of all), firstly, to begin with, before anything else
2. probably, most likely, almost certainly, virtually
3. more or less (satisfactory), on the whole, reasonably
4. anyway, at any rate, for now (at least), for the time being
1. indicates direct object of action
2. indicates subject of causative expression
3. indicates an area traversed
4. indicates time (period) over which action takes place
5. indicates point of departure or separation of action
6. indicates object of d...
