满清入关初期颁布圈地令，旗人携绳骑马，大规模地圈量占夺百姓土地。致使很多农民田地被占，流离失所，饥寒迫身；同时又强迫农民“投充”，补充其壮丁队伍。
空投充气筏 pararaft
投掷充填 centrifugal stowing ; throwing
投掷式充填机 throwing machine ; thrower
补充性投射 supplementary projection
扩充的投射原则 Extended Projection Principle
投稿补充说明 Computer Integrated Manufacturing Systems
补充投标 additive alternate
让招投标充满阳光 Construction Enterprise Management
投入补充者 input-completer
充电投光灯 rechargeable floodlight
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