驾驶员发现飞机的起落架不能缩回。

The pilot found that the undercarriage could not be retracted.

他话说了半截儿，又缩回去了。

He broke off half way and said no more.

我缩回空着的那只手，使劲地打了那只熊五六下。

Drawing back my free hand, I struck the bear as hard as I could for five to six times.

下面是可以作为住处、商店、酒吧和酒店的主卧舱和服务舱的上甲板，它被一个可以缩回的天蓬覆盖。

Just below, the top deck of the main accommodation and service Spaces - which could house shops, bars and restaurants - would be covered by a retractable canopy.

第三次，他的光脚丫子刚碰到沙子就痛得叫喊起来，说时迟那时快，他一只脚缩回马镫上，另一只脚半已跨到了布里的脊背上。

But the third time, as his bare feet touched the sand he screamed with pain and got one foot back in the stirrup and the other half over Bree's back before you could have said knife.