例句與造句

1. Proper planning includes avoiding clutter sources such as land surfaces, vegetation, buildings, complex terrain, aircraft ( particularly rotary wing ) and particulate matter kicked up by wind or aircraft . The enemy may attempt to avoid the directional radar systems or even use electronic countermeasures, so active patrolling, and activating the radar at random times and in random directions will act as a counter-countermeasure.
2. It's difficult to find clutter source in a sentence. 用clutter source造句挺難的