The word has fallen into disuse.
这个词已废而不用了。
Some words have fallen into disuse now.
有些词现在已经不用了。
Here are some words that have fallen into disuse.
这是一些废弃不用的词。
The route was once much travelled but has fallen into disuse.
这条路线旅行的人以前常走，但是现在已不用了。
Because of lack of sensitivity, the apparatus has already fallen into disuse.
由于灵敏度太低，这种仪器已经被淘汰了。
Because of lack of sensitivity, the apparatus has already fallen into disuse.
由于灵敏度太低，这种仪器已经被淘汰了。
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