해설
This sentence has four third tones in a row: 我想买两 (wǒ xiǎng mǎi liǎng), then 本 (běn), so reading it syllable by syllable sounds heavy and invites mistakes. First split it into two meaning groups: 我想买 / 两本书. Apply third-tone sandhi inside each group: a third tone before another third tone is said almost like a second tone, giving wó xiáng mǎi / liáng běn shū. 本 before 书 (first tone) is only a low half-third tone, without the rise. Note that 书 (shū) starts with the retroflex sh, not the Vietnamese “x”. When you repeat, say each group in one breath, pause very lightly between them and let your voice fall at the end of the statement.