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dent-tooth-tusk

tusk [tʌsk] (k无意）
either of the two long pointed teeth which stick out from the mouth of some animals such as elephants.
n. 长牙；尖头，尖形物
vt. 以牙刺戳；以长牙掘

denture['dentʃə]
1. an artificial replacement of one or several of the teeth (partial denture), or all of the teeth (full denture) of either or both jaws; dental prosthesis.
2. a set of teeth
n. 齿列，托牙；一副假牙

indent [in'dent, 'indent]
to start a line of print or writing further away from the edge of the page than the other lines
Chiefly British An official requisition or purchase order for goods.
vt. 缩排；印凹痕；【主英】订(货)
vi. 切割成锯齿状
n. 缩进；订货单；凹痕；契约

例句
We usually indent the first line of a paragraph.
我们常常把每段的第一行缩排。
The sea indents the coast.
海水将海岸冲击得凹凸不平。

indenture [in'dentʃə]
A document in duplicate having indented edges
Often indentures A contract binding one party into the service of another for a specified term.
A deed or legal contract executed between two or more parties
To bind into the service of another by indenture
n. 契约；合同
vt. 以契约约束

耶鲁公开课 - 金融市场课程节选
people own bonds without reading the indenture.
债券持有人并不去阅读契约。

edentulous[i:'dentʃuləs] e=ex=out
lacking teeth; toothless
adj. [脊椎] 缺齿的，[脊椎] 无齿的

edentate[i:'denteit]
Lacking teeth
Of or belonging to the order Edentata, which includes mammals having few or no teeth, such as anteaters, armadillos, and sloths.
A member of the Edentata.
n. [脊椎] 贫齿类动物
adj. 无齿的；贫齿类的；贫齿目的（属于贫齿目的，包括无齿和少齿的哺乳动物，如食蚁兽、犰狳和树懒）

趣味单词

ledger ['ledʒə] 赖着
a book in which items are regularly recorded, especially business activities and money received or paid
n. 总帐，分户总帐；[会计] 分类帐；帐簿；底帐；（手脚架上的）横木

耶鲁公开课 - 公正课程节选
On the other hand, there were positive effects and those were added up on the other side of the ledger.
但另一方面，也有正效应,它们被记在账目的另一侧。