rolling landing meaning in English

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As she rose on to the high country , she could see on her left , on a height above the rolling land , the shadowy , powerful bulk of warsop castle , dark grey , with below it the reddish plastering of miners dwellings , newish , and below those the plumes of dark smoke and white steam from the great colliery which put so many thousand pounds per annum into the pockets of the duke and the other shareholders
当汽车驶到了高原上面时，她看向见左手边，在一个高临乡野的高地上，那深灰色的，暗淡而雄壮的华梭勃宫堡，下面是些带红色的半新的工人住宅。再下面，便是煤场的大工厂，还正在曰着一缕缕的灰暗的烟和自蒸气，这工厂每年是要把几千几万金镑放在公爵和其他股东的腰包里的。