小偷以猫一般的轻盈潜入房间，没有发出任何声响。

The thief entered the room with ___catlike silence, making no sound at all.

他猫一样蹑手蹑脚地穿过房间，没有发出一点声音。

He moved across the room with ___catlike stealth, making no sound at all.