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问题: read by

In Britain,for example,there are plenty of
anecdotes describing how glow-worms have been
used to read by or used as emergency bicycle
lamps when a cyclist's batteries have failed
without warning.

read by 貌似不是一个短语?这里该怎么理解??

解答:

这里read by确不是一个固定短语。这里的介词by是表示“借助、依据”的意思。也就是要借助或凭借萤火虫的光亮来读书的意思。