if respiration is difficult 如果是很难呼吸 ; 如呼吸困难 ; 如果呼吸是难的
Respiration is difficult at great heights.
在很高的高原上呼吸很困难。
FIRST AID FOR INHALATION: Remove from dusty area to fresh air. If not breathing give artificial respiration. If breathing is difficult, give oxygen. Call a physician.
吸入急救：将受害者抬到具有新鲜空气的场所去。如果没有了呼吸，给予人工呼吸；如果呼吸困难，输氧；就医诊治。
Since the respiration rate is difficult to get, neural network modeling technique and DO process mathematic model are combined to obtain the hybrid model of DO.
由于溶解氧过程模型中的呼吸率不易直接得到，将神经网络建模技术与溶解氧过程数学模型相结合得到溶解氧的混合非线性过程模型。
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