Objective: To analyze the aberration properties of contact lens and its central back vertex power measurement.

目的：探讨接触镜的球差特征以及后顶焦距测量的实质。

youdao

They are interesting for the fact that they are very plain and undecorated for the time, with only one plain central panel at the back and no armrests.

很有趣的是，当时它们很普通，没有装饰，只是后面有一个简单的中央面板，没有扶手。

youdao

A 9-year-old Central California boy braved strong currents and cold water to swim from San Francisco to Alcatraz Island and back.

加州中部一名9岁的男孩不顾湍急的水流和冰冷的海水，从旧金山游到了恶魔岛，然后又游了回来。

youdao

And I believe we pulled the economy back from the abyss." To combat a crippling credit freeze, central banks slashed interest rates and pumped cash into credit markets.

VOA: standard.2010.04.21

Many central banks in Europe they have dates that go back to the eighteenth or nineteenth century.

许多欧洲的中央银行,他们都能追溯到,十八世纪或十九世纪。

耶鲁公开课 - 金融市场课程节选

It's also about: how banks operate; what their function is in our society; and, why they are such important institutions that have gone back for hundreds of years and remain powerful, central features in our economy.

也会讲到,银行如何运作,银行在社会上的功能,以及为什么几百年来,银行依然在经济生活中拥有,重要的作用

耶鲁公开课 - 金融市场课程节选

According to our source, Apple will make one major change to the rear casing, adding a metal panel to the central back of the new iPhone.

FORBES: Confirmed? New iPhone Will Be Longer and Thinner and Have Smaller Dock Connector

The bill is intended to shift power from central government back into the hands of individuals, communities and councils.

BBC: Bristol's Redcliffe Way could close under Localism Bill

However, the Central Bank hands back its surplus income to the Irish Exchequer, so these interest payments can be considered a circular transaction in which interest is handed over to the Central Bank to eventually be handed back to the Irish government.

FORBES: Ireland's Promissory Note Deal