这些书在图书馆里。

The ___books are in the library.

雷达系统需要保持视线畅通才能准确追踪目标。

The radar system needs a clear ___LOS to accurately track the target.

连续五场失利后，他们的排名跌到了最后一名。

After five straight ___losses, their ranking dropped to the bottom.