Jerome K. Jerome · 1859
Heavy going at CET-4 level. Not unreadable — just not readable the look-every-word-up way.
Coverage = the share of words in the text you already know. The research gives two lines: 98% before independent fluent reading is realistic, 95% for the instructional level that needs support (Hu & Nation, 2000). Proper nouns are not counted as unknown — recognising that it is a name is enough; this book has 431 of them.
Advanced — read it with glosses. 67,284 words in total; at 150 words a minute for a non-native reader, about 7 h 29 min to finish. Average sentence length 19.9 words. Reaching 95% coverage on this book (the floor for readability) takes roughly 17,750 word families.
The opening of Three men in a boat (to say nothing of the dog), word for word. Tap any word you don't know and its meaning here appears beside it — no sign-up, tap as often as you like.
There were four of us—George, and William Samuel Harris, and myself, and Montmorency. We were sitting in my room, smoking, and talking about how bad we were—bad from a medical point of view I mean, of course.
We were all feeling seedy, and we were getting quite nervous about it. Harris said he felt such extraordinary fits of giddiness come over him at times, that he hardly knew what he was doing; and then George said that _he_ had fits of giddiness too, and hardly knew what _he_ was doing. With me, it was my liver that was out of order. I knew it was my liver that was out of order, because I had just been reading a patent liver-pill circular, in which were detailed the various symptoms by which a man could tell when his liver was out of order. I had them all.
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Computed by Readii from the public-domain text (updated 2026-10-21), not estimated by hand. The Readii reading level is our own scale, anchored on unknown-word density; it is not the same system as Lexile or AR and does not convert directly. Unknown words are measured against the CET-4 ∪ Gaokao lists, so this is difficulty for a Chinese-speaking learner, not a native-child reading level.