それからその路線の通る最良の道筋を決める必要がある。それは何よりもその路線が通る地形によって決まる。

and then; after that

that (something or someone distant from the speaker, close to the listener; actions of the listener, or ideas expressed or understood by the listener); the; um...; er...; uh...

route; line; alignment

indicates possessive; nominalizes verbs and adjectives; substitutes for "ga" in subordinate phrases; (at sentence-end, falling tone) indicates a confident conclusion; (at sentence-end) indicates emotional emphasis; (at sentence-end, rising tone) indicates question

to go by; to go past; to go along; to travel along; to pass through; to use (a road); to take (a route); to go via; to go by way of; to run (between); to operate (between); to connect; to go indoors; to go into a room; to be admitted; to be shown in; to be ushered in; to come in; to penetrate; to pierce; to skewer; to go through; to come through; to permeate; to soak into; to spread throughout; to carry (e.g. of a voice); to reach far; to be passed on (e.g. of a customer's order to the kitchen); to be relayed; to be conveyed; to pass (a test, a bill in the House, etc.); to be approved; to be accepted; to go by (a name); to be known as; to be accepted as; to have a reputation for; to be coherent; to be logical; to be reasonable; to be comprehensible; to be understandable; to make sense; to get across (e.g. of one's point); to be understood; to be straight (e.g. wood grain); to be well-informed; to be wise; to do ... completely; to do ... thoroughly

the best; ideal

path; route; itinerary

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 decide; to choose; to determine; to make up one's mind; to resolve; to set one's heart on; to settle; to arrange; to set; to appoint; to fix; to clinch (a victory); to decide (the outcome of a match); to persist in doing; to go through with; to always do; to have made a habit of; to take for granted; to assume; to dress up; to dress to kill; to dress to the nines; to carry out successfully (a move in sports, a pose in dance, etc.); to succeed in doing; to immobilize with a double-arm lock (in sumo, judo, etc.); to eat or drink something; to take illegal drugs

necessary; needed; essential; indispensable; necessity; need; requirement

indicates sentence subject (occasionally object); indicates possessive (esp. in literary expressions); but; however; still; and

to be (usu. of inanimate objects); to exist; to live; to have; to be located; to be equipped with; to happen; to come about

that (indicating an item or person near the listener, the action of the listener, or something on their mind); it; that time; then; there (indicating a place near the listener); you

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

what; how many; you-know-what; that; whatsit; what's the expression; what do you call them; what?; hey!

than; from; out of; since; at; on; except; but; other than; more

too; also; in addition; as well; (not) either (in a negative sentence); both A and B; A as well as B; neither A nor B (in a negative sentence); even; as much as; as many as; as far as; as long as; no less than; no fewer than; even if; even though; although; in spite of; further; more; again; another; the other

terrain; geographical features; topography

according to; by (means of); due to; because of

to be decided; to be settled; to look good in (clothes)