If you toss a coin and it comes down tails, you can see the side of it that does not have a picture of a head on it.
'Heads or tails?'
“正面还是反面?”
The captain called heads as usual – and the coin came down tails.
队长像以往一样猜了正面—可硬币反面朝上落了下来。
tails
The tail of an animal, bird, or fish is the part extending beyond the end of its body.
a black dog with a long tail.
一只长尾巴的黑狗。
The cattle were swinging their tails to disperse the flies.
牛摇动尾巴驱赶蚊蝇。
You can use tail to refer to the end or back of something, especially something long and thin.
the horizontal stabilizer bar on the plane's tail.
飞机尾部的水平平衡杆。
If a man is wearing tails, he is wearing a formal jacket which has two long pieces hanging down at the back.
men in tails and women in party dresses.
穿燕尾服的男士和穿宴会礼服的女士。
tail off
When something tails off, it gradually becomes less in amount or value, often before coming to an end completely.
wear off , abate
Last year, economic growth tailed off to below four per cent.
去年,经济增长率逐渐降到了4以下。
The drug's effect does not tail off after it has been used repeatedly.
该药反复使用之后,药效不会消退。
tails , tailing , tailed
To tail someone means to follow close behind them and watch where they go and what they do.
Officers had tailed the gang during a major undercover operation.
警方在一次重大的秘密行动中跟踪过这个团伙。