The myth of the hydra comes from ancient Greece.九头蛇的神话源自古希腊。

A hydra is a tiny freshwater animal.水螅是一种微小的淡水动物。

Drug abuse is a hydra that grows back.吸毒是斩而复生的祸患。

The monster in the tale resembles a hydra.故事里的怪物像一条九头蛇。

Firefighters connected the hose to a hydrant.消防队员把水带接到消防栓上。

The street corner has a red fire hydrant.街角有一个红色消防栓。

Drivers must not park near a hydrant.司机不得在消防栓附近停车。

The hydrant supplies water for the block.这个给水栓为街区供水。

Drink water to hydrate your body.喝水给身体补水。

Chemists call this blue salt a hydrate.化学家把这种蓝盐称为水合物。

Athletes hydrate before long races.运动员在长跑前补充水分。

The lotion helps hydrate dry skin.这种润肤露帮助滋润干燥皮肤。

The sun will dehydrate the fruit quickly.太阳会很快晒干水果。

Travelers dehydrate easily in dry air.旅行者在干燥空气中容易脱水。

The machines dehydrate vegetables for storage.机器把蔬菜脱水以便储存。

Fever can dehydrate the patient.发烧会使病人脱水。

The chemist used anhydrous alcohol.化学家使用无水酒精。

Anhydrous ammonia is a farm fertilizer.无水氨是一种农田肥料。

The lab stores anhydrous compounds in dry boxes.实验室把无水化合物存放在干燥箱中。

This powder must stay anhydrous.这种粉末必须保持无水状态。

The excavator has a hydraulic arm.挖掘机有液压臂。

Engineers study hydraulic pressure.工程师研究水压。

The dam uses large hydraulic gates.大坝使用大型水力闸门。

A hydraulic lift raises the car.液压升降机把汽车顶起。

Hydrogen is the lightest element.氢是最轻的元素。

Water contains hydrogen and oxygen.水含有氢和氧。

The bus runs on hydrogen fuel.这辆公共汽车用氢燃料驱动。

Stars burn hydrogen in their cores.恒星在核心燃烧氢。

The region relies on hydroelectric power.该地区依赖水力发电。

The dam created a hydroelectric plant.大坝建起了一座水力发电厂。

Hydroelectric dams supply clean energy.水坝提供清洁能源。

They visited a hydroelectric station.他们参观了一座水电站。

The old hydroplane flew over the bay.那架旧水上飞机飞过海湾。

A fast hydroplane raced across the lake.一艘快艇在湖面疾驰。

Wet roads can make cars hydroplane.湿滑路面会让车辆打滑。

The hydroplane skimmed the waves.水上飞机掠过浪尖。

The hydrofoil glides above the water.水翼船在水面上滑行。

Tourists took a hydrofoil to the island.游客乘客水翼船去岛上。

A hydrofoil lifts the hull out of the water.水翼把船体托出水面。

The hydrofoil reached the harbor in ten minutes.水翼船十分钟就抵达港口。

Hydroponics grows plants without soil.水培不用土壤种植植物。

The farm uses hydroponics for lettuce.农场用水培种植生菜。

Hydroponics saves water in dry regions.水培在干旱地区节约用水。

Students learned about hydroponics in class.学生在课堂上学到无土栽培。

The patient tried hydrotherapy for back pain.病人尝试水疗治疗背痛。

Hydrotherapy pools are warm and shallow.水疗池温暖而浅。

The clinic offers hydrotherapy sessions.诊所提供水疗疗程。

Many athletes use hydrotherapy after training.许多运动员训练后做水疗。

Hydrolysis breaks down molecules with water.水解用水分解分子。

Soap making relies on hydrolysis of fats.制皂依靠脂肪的水解。

The reaction is called acid hydrolysis.这种反应叫做酸性水解。

Enzymes speed up hydrolysis in the gut.酶加速肠道内的水解。

Oil is a hydrocarbon mixture.石油是碳氢化合物的混合物。

Cars release hydrocarbon emissions.汽车排放碳氢化合物废气。

Natural gas is a simple hydrocarbon.天然气是一种简单的烃。

The refinery processes every hydrocarbon fraction.炼油厂处理每一种烃馏分。

Rabies causes hydrophobia in its late stage.狂犬病晚期会引起恐水症。

The dog showed signs of hydrophobia.这只狗表现出恐水症状。

Hydrophobia is another name for rabies.恐水症是狂犬病的别名。

The victim could not drink due to hydrophobia.患者因恐水症无法饮水。

The whole hydroelectricity took several hours to complete.整个水力发电过程花了好几个小时才完成。

Proper hydroelectricity is essential if the results are to be reliable.若要结果可靠，恰当的水力发电至关重要。

The team studied the process of hydroelectricity with great care.团队非常仔细地研究了水力发电的过程。

The manager wrote a clear report on the hydroelectricity.经理就水力发电写了一份清晰的报告。

The manager decided to hydrogenate the problem before the meeting.经理决定在会前使氢化这个问题。

She will hydrogenate the task after the new plan is ready.新计划准备好后她会去使氢化这项任务。

They need to hydrogenate the materials before the class begins.上课前他们需要使氢化这些材料。

Nobody expected him to hydrogenate the plan so quickly.没人料到他这么快就使氢化了计划。

The new rule will be hydrous for everyone in the group.新规则对组里每个人都将是含水的。

They considered the plan hydrous after a long discussion.经过长时间讨论，他们认为该计划是含水的。

The manager gave a hydrous answer at the meeting.经理在会上给出了一个含水的的答复。

Every solution must be hydrous before it is approved.每个方案在获批前都必须是含水的的。