1、
The old elevator in the building has become functionless and needs to be replaced.
大楼里的旧电梯已经没用了，需要更换。
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2、
The outdated software on my computer has become functionless and won't run properly.
我电脑上过时的软件已经失去了功能，无法正常运行。
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3、
经过多年的日常使用，我的手机充电器已经失去了功能，无法正确给手机充电。
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4、
he batteries in my flashlight have become functionless and need to be replaced.
我的手电筒电池已经没用了，需要更换。
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5、
The drain in my sink has become functionless and won't drain water properly.
我水槽里的排水口已经失去了功能，无法正常排水。
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