necessitate例句
To map 100 mutants by this method would
necessitate nearly 5,000 crosses.
用这种方法来绘制100个突变型的遗传图就要做5000个杂交.
The agglomeration and sintering of fine particles can
necessitate a lowering in temperature of operation.
由于微粒易于聚集和烧结,不得不降低操作温度.
This may
necessitate transmitting and receiving signals in different frequency bands.
这可能使在不同频段内发射及接收信号成为必要的.