singlet
n
(Brit)
(a) man's sleeveless garment worn under or instead of a shirt; vest 男用无袖汗衫; 背心.
(b) such a garment worn by runners, athletes, etc 无袖运动衫.
🗣️ 情景例句
Exploring outer space is a challenge to mankind.
探索外层空间是一项向人类发出的挑战。
Don't put off till tomorrow what should be done today.