これについてはすぐに決定を下さなければならない。

this (indicating an item near the speaker, the action of the speaker, or the current topic); this person (usu. indicating someone in one's in-group); now; here; I (me); certainly

concerning; regarding; per (e.g. 100 yen per person); for every

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

immediately; at once; directly; soon; before long; shortly; easily; without difficulty; right (near); nearby; just (handy)

at (place, time); in; on; during; to (direction, state); toward; into; for (purpose); because of (reason); for; with; by; from; as (i.e. in the role of); per; in; for; a (e.g. "once a month"); and; in addition to; if; although

decision; determination

indicates direct object of action; indicates subject of causative expression; indicates an area traversed; indicates time (period) over which action takes place; indicates point of departure or separation of action; indicates object of desire, like, hate, etc.

to make (a decision); to pass (judgement, etc.); to hand down (orders, etc.); to let go down; to lower; to do oneself; to do by oneself