kè / běn / jiè / shào / le / wǔ / kǒu / tōng / shāng / duì / yán / hǎi / mào / yì / de / yǐng / xiǎng

课本介绍了五口通商对沿海贸易的影响。

The textbook describes the impact of the opening of the five treaty ports on coastal trade.