The area of a basin may be limited by elevation changes, by the size that can be covered uniformly by the available water supply on permeable soils, or by cropping factors.
格田面积受限于地面高度的变化、现有水量均匀覆盖于渗透性土壤的面积大小及耕作因素。
Macro, micro and nano-scale technologies rely on scale-specific performance models, design methods and fabrication processes which may be used to engineer machines within a limited range of size.
巨观、微米和奈米尺度技术依赖于特定尺度的性能模型、设计方法和可用于有限范围大小的工程机械的制造过程。
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