hydraw静水压挤拔hydran.（希腊神话中的）九头蛇；难以根除之祸害；水螅Hydra.n.长蛇星座hydration model水化模型hydrangea leaves甘(茶)叶hydrauger method水冲钻孔法hydration method消解法hydraulie tunnel水工溢洪洞hydrazinium salt镜盐hydrazo compound肼基化合物hydracrylic acid羟基丙酸hydranlic system液压系统hydration sheath水化鞘