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Starfish are actinoid -- that is, they are radially symmetrical.是什么意思？

Starfish are actinoid -- that is, they are radially symmetrical.

海星呈放射性形状 —— 那就是说, 它们是呈对称的放射状.

相关词汇
starfish are actinoid that is they radially symmetrical

starfish

n. 海星（一种海洋动物）；
例句
Asteroidea ( starfish ) contains saponins, sterols, anthraquinones, alkaloids phospholipids and some other components.
海星含皂苷 、 甾醇 、 蒽醌 、 生物碱和脂类等物质.

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。

actinoid

adj. 放射线状的；
例句
Starfish are actinoid -- that is, they are radially symmetrical.
海星呈放射性形状 —— 那就是说, 它们是呈对称的放射状.

that

det. 那个，那；pron. 那个，那；conj. 多么，如此…以至，用于某些动词、形容词和名词后，引出各种从句；adv. 不那么，那样；
例句
...expensive make-up that we saw being advertised by a beautiful model...
我们所见的由一位漂亮模特代言的昂贵化妆品

is

vt.& vi. 是（be的三单形式；n. 存在；
例句
Bollinger 'RD' is a rare, highly prized wine.
博林格RD香槟是一种名贵的备受推崇的葡萄酒。

they

pron. 他/她/它们，人们，大家，政府，当局，她们；
例句
The storms had abated by the time they rounded Cape Horn.
他们绕过合恩角时，暴风雨已经减弱。

radially

--
例句
Starfish are actinoid -- that is, they are radially symmetrical.
海星呈放射性形状 —— 那就是说, 它们是呈对称的放射状.

symmetrical

adj. 对称的，匀称的；
例句
...the neat rows of perfectly symmetrical windows.
一排排整齐而且完全对称的窗子
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。
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。
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。
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 house was desolate, ready to be torn down.
这房子没人居住, 等着拆除.
The wind puffed away the seeds of the dandelion.
风吹散了蒲公英的种子.
A friend in need is a friend indeed.
患难之交才是真朋友
Jody S ． Kraus , Steven D ． Walt, The Jurisprudential Foundations of Corporate and Commercial Law, Introduction at 1 , Cambridge University Press, 2000.
大卫·弗里德曼:《经济学语境下的法律》, 杨欣欣译, 法律出版社2004年版, 第20页.
There are no legal impediments to their appealing against the decision.
他们对这一决定提出上诉不会遇到法律障碍.
She took her failure in the examination to heart.
她为考试不及格而伤心不已。
Andrea assumed his gayest manner.
安德烈拿出他最高兴的态度.
Fuel propane is scented with mercaptan odourants for leak detection.
燃料丙烷通常添加硫醇这种刺激性的物质用于泄漏检测.
And as in China, unrest and even insurgency are widespread.
而在中国, 动乱甚至暴乱都普遍存在.
Although his mental illness had coincided with his war service it had not been caused by it.
虽然他的精神病刚好在他参战期间发作，但并不是由此引起的。