私たちは、油が水に浮くことを習った。

we; us

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

oil

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

water (esp. cool, fresh water, e.g. drinking water); fluid (esp. in an animal tissue); liquid; flood; floodwaters; water offered to wrestlers just prior to a bout; break granted to wrestlers engaged in a prolonged bout

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

to float; to become merry; to be cheerful; to become loose; to become unsteady; to feel out of it; to be cut off (e.g. from those around you); to feel out of place; to be frivolous; to be uncertain; to have (time, money, etc.) left over; to be saved (e.g. money); to have no basis; to be unreliable

thing; matter; incident; occurrence; event; something serious; trouble; crisis; circumstances; situation; state of affairs; work; business; affair; after an inflectable word, creates a noun phrase indicating something the speaker does not feel close to; nominalizing suffix; pretending to ...; playing make-believe ...; alias; aka; nickname; alternative name; also known as

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 take lessons in; to be taught; to learn (from a teacher); to study (under a teacher); to get training in