While Nasa's focus was on how to prevent the insulating foam breaking off, concerns also emerged earlier this year about the build-up of ice on the outside of the fuel tank.

正当美国宇航局将工作重点放在如何防止泡沫绝缘材料脱落时，今年年初人们又开始担心燃料箱外侧集结的冰是否也会对航天飞机的飞行安全构成威胁。

youdao

While Nasa's focus was on how to prevent the insulating foam breaking off, concerns also emerged earlier this year about the build-up of ice on the outside of the fuel tank.

正当美国宇航局将工作重点放在如何防止泡沫绝缘材料脱落时，今年年初人们又开始担心燃料箱外侧集结的冰是否也会对航天飞机的飞行安全构成威胁。

youdao