When I heard it on the English file, it sounded weird, so I looked it up.
The reason: they have different pronunciations in american English and in British English.
– vase: /va:z/ (Br. E.)
/veɪz/ (Am.E.)
– zebra /’zebrə/ (Br.E.)
/’zi:brə/ (Am.E.)
It looks like I’ve listened to too much American television…