ガリレオは二つの鉄の玉を塔のてっぺんから落とした。

self interest

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

two

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

iron (Fe); strong and hard (as iron); railway; railway enthusiast

ball; sphere; globe; orb; bead (of sweat, dew, etc.); drop; droplet; ball (in sports); pile (of noodles, etc.); bullet; bulb (i.e. a light bulb); lens (of glasses, etc.); bead (of an abacus); ball (i.e. a testicle); gem; jewel (esp. spherical; sometimes used figuratively); pearl; female entertainer (e.g. a geisha); person (when commenting on their nature); character; item, funds or person used as part of a plot; egg; coin; precious; beautiful; excellent

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.

tower; steeple; spire; stupa; pagoda; dagoba

top; summit; apex; peak; twelve o'clock (usu. midnight); top of one's head; top of a helmet; (top of) scalp; crown

from (e.g. time, place, numerical quantity); since; from (originator); by; because; since; out of (constituent, part); through (e.g. window, vestibule); after; since

to drop; to lose; to let fall; to shed (light); to cast (one's gaze); to pour in (liquid); to leave behind; to clean off (dirt, makeup, paint, etc.); to remove (e.g. stains or facial hair); to lose; to spend money at a certain place; to omit; to leave out; to secretly let escape; to lose (a match); to reject (an applicant); to fail (a course); to defeat (in an election); to lower (e.g. shoulders or voice); to lessen (e.g. production or body weight); to worsen (quality); to reduce (e.g. rank or popularity); to speak badly of; to make light of; to fall into straitened circumstances; to fall into (e.g. a dilemma or sin); to make one's own; to have one's bid accepted; to force surrender; to take (e.g. an enemy camp or castle); to forcefully convince; to press for a confession; to deal with; to download; to copy from a computer to another medium; to make someone swoon (judo); to finish a story (e.g. with the punch line); to finish (a period, e.g. of fasting)