Dié yǒng shì yóuyǒng bǐsài zhōng nándù zuì dà de xiàngmù zhī yī.
Butterfly stroke is one of the most difficult events in swimming competitions.
Tips
usage
蝶 is a bound form — it almost never stands alone. In everyday speech, butterfly is 蝴蝶 (húdié). 蝶 appears in compounds like 蝶泳 (butterfly stroke in swimming) and 粉蝶 (white cabbage butterfly).