index fossil

/ˈɪndɛks ˈfɑsəl/

Meanings

noun

标准化石，指示化石

Any ancient remains of a plant or animal that lived during a specific geological period and that can be used to date the containing rocks.

Examples :

"Finding the index fossil Trilobite in a rock layer tells scientists that the rock is about 500 million years old. "

在岩层中发现标准化石三叶虫，能告诉科学家这层岩石大约有五亿年的历史。

Related Words

trilobite noun

/ˈtɹaɪ.ləˌbaɪt/

三叶虫

"While studying fossils in class, Sarah learned that a trilobite is an ancient sea creature with a body divided into three distinct parts. "

萨拉在课堂上研究化石时了解到，三叶虫是一种古老的海生生物，它的身体明显地分为三个部分。

containing verb

/kənˈteɪnɪŋ/

包含，容纳。

"The box containing my old toys was stored in the attic. "

装有我旧玩具的箱子被储存在阁楼里。

scientists noun

/ˈsaɪəntɪsts/

科学家，科研人员。

"Scientists study plants to understand how they grow. "

科学家研究植物，从而了解它们的生长方式。

period noun

/ˈpɪəɹɪəd/

时期，期间。

"There was a period of confusion following the announcement."

宣布之后，有一段时间大家都非常困惑。

remains noun

/ɹɪˈmeɪnz/

遗骸，残余，剩余物。

"After the party, the only remains were empty plates and a few scattered candies. "

派对结束后，剩下的只有空盘子和几颗散落的糖果。

ancient noun

/ˈeɪn.ʃənt/

古人，老人

"The ancient librarian was known for her vast knowledge of history. "

这位年迈的图书管理员以她渊博的历史知识而闻名。

specific noun

/spəˈsɪf.ɪk/

特性，特点。

"The specific of her success was her dedication to studying. "

她成功的特性在于她对学习的专注。

geological adjective

/ˌdʒiː.əˈlɒdʒ.ɪk.əl/ /ˌdʒi.əˈlɑdʒ.ɪk.əl/

地质的，地质学的。

"The rock layers in the Grand Canyon provide a detailed geological record of the Earth's past. "

大峡谷的岩层提供了地球过去详细的地质记录。

finding verb

/ˈfaɪndɪŋ/

发现，撞见

"While walking to school, Sarah found a lost wallet on the sidewalk. "

在上学路上，萨拉在人行道上 случайно 撞见了一个丢失的钱包。

million numeral

/ˈmɪljən/

百万

"The company made a profit of one million dollars last year. "

去年这家公司盈利了一百万美元。

during verb

/ˈdjɔː.ɹɪŋ/ /ˈdʒɔːɹɪŋ/ /ˈd(j)ʊɚ.ɪŋ/

持续，延续，持久。

"The storm during all night. "

暴风雨持续了整夜。

animal noun

/ˈænɪməl/

动物，牲畜

"A cat is an animal, not a plant. Humans are also animals, under the scientific definition, as we are not plants."

猫是动物，不是植物。按照科学定义，人类也是动物，因为我们不是植物。