The second item in a series is the one that you count as number two.
the second day of his visit to Delhi.
他访问德里的第二天。
their second child.
他们的第二个孩子。
the Second World War.
第二次世界大战。
Second is used before superlative adjectives to indicate that there is only one thing better or larger than the thing you are referring to.
The party is still the second strongest in Italy.
该党仍是意大利第二大党。
You say second when you want to make a second point or give a second reason for something.
First, the weapons should be intended for use only in retaliation after a nuclear attack. Second, the possession of the weapons must be a temporary expedient.
首先,这些武器应当只在遭受核袭击后反击时才使用。其次,拥有这些武器必须只是一种临时的应急手段。
seconds
A second is one of the sixty parts that a minute is divided into. People often say 'a second' or 'seconds' when they simply mean a very short time.
For a few seconds nobody said anything.
有几秒钟没一个人说话。
It only takes forty seconds.
这只需40秒。
If you have seconds, you have a second helping of food.
There's seconds if you want them.
你想要的话还有。
Seconds are goods that are sold cheaply in shops because they have slight faults.
These are not seconds, or unbranded goods, but first-quality products.
这些既不是次品也不是无牌货,而是质量一流的产品。
at second hand
If you experience something at second hand, you are told about it by other people rather than experiencing it yourself.
Most of them, after all, had not been at the battle and had only heard of the massacre at second hand.
毕竟,他们中的大多数人都没有亲历那场战争,而只是间接听说过那场大屠杀。
second to none
If you say that something is second to none, you are emphasizing that it is very good indeed or the best that there is.
Our scientific research is second to none.
我们的科学研究不亚于任何人。
second only to something
If you say that something is second only to something else, you mean that only that thing is better or greater than it.
As a major health risk hepatitis is second only to tobacco.
肝炎仅次于吸烟,是主要的健康隐患之一。
seconds , seconding , seconded
If you second a proposal in a meeting or debate, you formally express your agreement with it so that it can then be discussed or voted on.
Bryan Sutton, who seconded the motion against fox hunting.
附议反对猎狐行动的布赖恩·萨顿。
If you second what someone has said, you say that you agree with them or say the same thing yourself.
The UN secretary-general seconded the appeal for peace.
联合国秘书长支持这项对和平的号召。