VOA慢速英语:Motor-Free Device Reduces Stress from Walking

短语讲解：

1. The researchers found that the human body parts are able to both store and release energy, just like a spring.

be able to 能够
例句：The car would be unlikely to be able to make the turn.
汽车未必能作这样的转弯。

2. Mr. Sawicki says the device reduces the amount of energy required for walking by as much as seven percent.

as much as 差不多
例句：I try to ward off fatigue by resting as much as possible.
为了防止疲劳，我尽可能多休息。

3. Mr. Sawicki says it takes only a few minutes for someone to get used to the ankle exoskeleton.

get used to 习惯于
例句：It is difficult to get used to another country's customs.
要适应另一国家的风俗习惯是很困难的.

4. You really don't notice it until when you take it off.

take off 脱掉;起飞;（使）离开;突然成功
例句：What I want to know is when the plane is to take off.
我想知道的是飞机何时起飞。