有限元分析法在理论上较成熟，但因其存在土体模型和土性参数难确定等困难，难以实际应用。
The finite element method is mature in theory, but it is difficult to fix the earth model and the soil parameters, so being difficulty to be practice applied.
两冲程汽油动力的工具的环境污染和噪音是众所周知的厉害，但电动的替代品又往往持久力不足，难以实际使用。
Two-stroke, gas-powered tools are famously polluting and loud, but electric variants typically lack the power or durability to really be practical.
从实际的角度来看，这项法律可能难以执行。
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