You can vary their width, speed, and length.
你能改变它们的宽度、速度和长度。
The fortress was well protected by thick and tall walls. Their width sometimes reached 20 m.
要塞被又厚又高的墙保护着,有些地方的墙甚至厚达20米。
Borders range from 3 to 30 m wide and must be nearly level across their width so the entire area will be irrigated uniformly.
畦宽3—30米,沿宽度方向必须接近水平,以便使全部面积都能得到均匀的灌溉。
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