1. The dog guarded the house against strangers. 狗守着房屋，不让陌生人进去。
2. From afar, this piece of green bamboo as a barrier, like the green rows of guards, guarded in silence next to the stream. 远远望去，这竹林一片翠绿像一道屏障，又像一排排绿色的卫兵，默默地守卫着旁边的小溪。
3. THE PRESIDENT:First, let me condition the press this way. Any sources and methods of intelligence will remain guarded and secret. 总统：首先，我会以此方式召开记者招待会。情报的任何来源及方式都会保持谨慎和机密。
