この部屋はガスのにおいがする。

this (something or someone close to the speaker (including the speaker), or ideas expressed by the speaker)

room; apartment; flat; pad; chamber; stable

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

gas (state of matter, e.g. poison gas, natural gas); gasoline; gas; petrol; dense fog; thick fog; gas stove; gas cooker; gas range; flatulence; gas; wind; fart

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

odour; odor; scent; smell; stench; aura; whiff; smacks of ...; sense; flavour; flavor

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

to do; to cause to become; to make (into); to turn (into); to serve as; to act as; to work as; to wear (clothes, a facial expression, etc.); to judge as being; to view as being; to think of as; to treat as; to use as; to decide on; to choose; to be sensed (of a smell, noise, etc.); to be (in a state, condition, etc.); to be worth; to cost; to pass (of time); to elapse; verbalizing suffix (applies to nouns noted in this dictionary with the part of speech "vs"); creates a humble verb (after a noun prefixed with "o" or "go"); to be just about to; to be just starting to; to try to; to attempt to