その医師はガンの多くの不可解な点を解こうと努力している。

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...

doctor; physician

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

wild goose; glans; head of a penis

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

many; much; largely; abundantly; mostly

mystery; baffling; inexplicable; incomprehensible

spot; mark; point; dot; mark (e.g. in exam); score; points; comma; aspect; matter; respect; counter for goods, items, articles of clothing, works of art, etc.

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 untie; to unfasten; to unwrap; to undo; to unbind; to unpack; to unsew; to unstitch; to solve; to work out; to answer; to dispel (misunderstanding, etc.); to clear up; to remove (suspicion); to appease; to dissolve (a contract); to cancel; to remove (a prohibition); to lift (a ban); to raise (a siege); to release (from duty); to relieve; to dismiss; to comb (out); to card; to untangle (hair)

if; when; and; with; particle used for quoting (with speech, thoughts, etc.); quoting particle; promoted pawn; indicates question (sentence end)

great effort; exertion; endeavour; endeavor; effort