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Tropical year, and sidereal year are two different concepts.是什么意思？

Tropical year, and sidereal year are two different concepts.

回归年与恒星年是不同的两个概念.

相关词汇
tropical year and sidereal are two different concepts

tropical

adj. 热带的，炎热的，热情的；
例句
... the mile of white sand beach bordered by palm trees and tropical flowers
四周种有棕榈树和热带花卉的长达1英里的白色沙滩

year

n. 年，年纪，一年的期间，某年级的学生；
例句
The following year Parliament voted to abolish the death penalty for murder...
议会于翌年表决对谋杀罪废除死刑。

and

conj. 和，与，而且，于是，然后，因此；
例句
I spend a lot on expensive jewelry and clothing...
我花很多钱购买昂贵的首饰和衣服。

sidereal

adj. 星的，根据恒星测定的；
例句
The sidereal year is not used to construct a calendar.
恒星年不用于编制年历.

are

vi. （用于第二人称单复数现在时，第一、三人称复数现在时）是；n. 公亩（等于100平方米）；
例句
We are scared to abandon ourselves to our feelings in case we seem weak or out of control.
我们不敢放纵自己的情感，以免显得太过软弱或缺乏自制。

two

n. 两个，两个东西，两点钟，一对；adj. 两个的，我
例句
He has been absent from his desk for two weeks...
他已经有两个星期没有坐在办公桌前了。

different

adj. 不同的，各式各样的，个别的，不平常；
例句
Different schools teach different types of syllabus, from the highly academic to the broadly vocational.
不同的学校有不同的教学计划，从高度学术的到普通职业教育的，不一而足。

concepts

n. 概念( concept的名词复数 )，观念，想法，总的印象；
例句
These old concepts are irreconcilable with modern life.
这些陈旧的观念与现代生活格格不入。
热门例句
He acknowledged publicly that he might have made a mistake.
他当众承认自己可能犯了个错误。
...the spiralling vortex airflow that slows the plane.
使飞机减速的螺旋形气流涡旋
You just go on ahead. I'll come by later...
你只管先往前走。我随后就来。
He who spares his rod hates his son, But he who loves him chastens him early.
24不忍用杖打儿子的,是恨恶他;疼爱儿子的, 趁早管教.
For further information, please contact 414 3925, extension 2253.
详情请致电414 3925,转分机2253。
Baroness Thatcher's claims seem credible to many.
撒切尔女男爵的主张在很多人看来是可信的。
He sat there while I made the case for his dismissal...
他坐在那儿，听我陈述解雇他的理由。
Nothing to be got without pains but poverty.
一份耕耘，一份收获。
This decree obliges unions to delay strikes.
该法令迫使工会推迟罢工。
The right to demand payment from the endorser of a commercial paper when the first party liable fails to pay.
追索权当有支付义务的第一方不能支付时，可以向商业票据的背书人要求支付的权力。
相关例句
The biggest increase was on the cheapest model, the CRX-HF. That car had a 1990 base price of $9,145.
涨价最快的是最便宜的车型CRX-HF，那款车1990年的基价是9,145美元。
Newman fled barefoot as the cheated husband erupted in fury.
被戴绿帽的丈夫勃然大怒，纽曼吓得光着脚逃走了。
The surface, said Cheng Siwei, if not an iota of harm.
表面看来, 成思危如是说, 好像并无丝毫危害.
Abstact : IEC low voltage integrated circuits standardand relatived standard in JEDEC were introduced mainly inthe thesis.
主要介绍 IEC 低压集成电路标准,以及JEDEC中相关的标准.
Some 90 % of its 2 m people are ethnic Albanians ( Kosovars ) who want independence.
占200万科索沃总人口90%阿尔巴尼亚人是想获得独立的.
As she spoke, she watched the muscles in his forearm flex when he shifted gears.
她一边说一边注视着他换挡时前臂弯曲的样子.
I love looking after the children...
我喜欢照顾小孩。
Some people annotate as they read.
有的人一面读书一面做注解.
The car must be returned to its rightful owner.
这辆车必须归还给真正的主人。
Her fingernails are bitten to the quick.
她的手指甲都被咬秃了。