Teams of experts were scrambling to understand just how serious the problem was, with "strong arguments" raging on what to do, if anything.
The trouble has nothing to do with foam or other launch debris, but rather the accidental slippage of ceramic-fiber cloth used to fill the thin gaps between thermal tiles, which some engineers worry could trigger potentially treacherous overheating during re-entry.

　　Spacewalking意为“太空行走，太空漫步”，即宇宙员步出航天器后在太空中的行走或舱外活动，在上文中作形容词“进行太空行走的”。