5英亩的基地有着不规则的形状和较缓和的坡度。
The 2.5 acres plot has an irregular shape and a smooth slope.
样条的坡度是缓和的，并且样条的高低两端相隔50英里以上。
The slope of the transect was gentle, and the high-and low-elevation ends of the transect were separated by more than 50 miles.
接着，我们来到一个地方。这里的河流两边高耸起树木丛生的小山，形成坡度缓和的V字形，留下只有约150码(约137米)宽的开阔走廊。
Then we came to a place where forested hills rose on both sides of the river to form a soft v, leaving a corridor of open ground only about 150 yards wide.
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