彼らがそんなに腹を立てているのはおかしいように思われている。

they (usually male); them

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

so much; so; like that

abdomen; belly; stomach; womb; one's mind; one's real intentions; one's true motive; courage; nerve; willpower; generosity; magnanimity; feelings; emotions; wide middle part; bulging part; inside; interior; inner part; anti-node; counter for hard roe; counter for containers with bulging middles (pots, vases, 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 stand up; to put up; to set up; to erect; to raise; to thrust into; to bury into; to dig into; to make (a noise); to start (a rumour); to raise (a cloud of dust, etc.); to cause; to make; to establish; to set up; to develop; to formulate; to put up (a political candidate); to make (one's leader); to treat with respect; to give (someone) their due; to make (someone) look good; to avoid embarrassing (someone); to sharpen; to make clear; to shut; to close; to make tea (macha); to perform the tea ceremony; to divide by; to do ... vigorously

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

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

funny; amusing; comical; laughable; ridiculous; strange; odd; funny; peculiar; weird; unusual; eccentric; improper; unsuitable; unbecoming; suspicious

in order to (e.g. meet goal); so that; take care (so as); hoping or wishing for something

to think; to consider; to believe; to think (of doing); to plan (to do); to judge; to assess; to regard; to imagine; to suppose; to dream; to expect; to look forward to; to feel; to desire; to want; to recall; to remember