VOA慢速英语:Airbus Adds Metal 3-D-Printed Parts to A350 XWB

短语讲解：

1. European airplane maker Airbus plans to have new passenger airplanes by the end of the year.

by the end of 到…为止
例句：Figure out your 2012 travel plans by the end of 2011.
2011年底的时候就制定出明年的旅行方案。

2. 3-D printing also helps when parts are no longer available.

no longer 不再，已不
例句：Quality is no longer an issue.
质量不再是个问题。

3. "We are investing a lot of money in aerodynamic improvement, in material, in noise reduction, etc., but 3-D printing is probably the area with the highest gain over time," Krein said.

a lot of 许多的; 诸多
例句：A lot of what's changing now is subtle.
许多变化都非常微妙。