1.The visitors seem happy to knock on the wooden houses to see if it is real wood. If you are the resident of that house, that is not pleasant, of course.
knock on敲擊
He went up the garden path to knock on the door.
他穿過花園小徑去敲門 。
2.The rules include not photographing residents without permission, not strolling into their gardens and not dropping litter.
without permission未經(jīng)許可;[法] 未經(jīng)許可
They cannot leave the country without permission.
他們不能擅自離開該國家 。