to prevent someone or something from entering
誰かまたは何かが入るのを防ぐ (dareka mata wa nanika ga hairu no o fusegu)
"Close the windows to keep out the dust during the renovation."
"改装中にほこりが入らないように窓を閉めてください。" (Kaisou-chuu ni hokori ga hairanai you ni mado o shimete kudasai.)
to spend a lot of time working
to enjoy the admiration and praise from others after achievi...
to work hard on something for a long period
generally speaking; on the whole
to do something revolutionary or extremely difficult
to keep changing your attitude or mood
