寄一盘新磁带过去不合算。It would be uneconomical to send a brand new tape.花钱修理不合算。It would be uneconomic to try and repair it.即使价格更高一些，这仍然很合算。This was still a good buy even at the higher price....
The impurity of supposedly pure subcellular fractions is a constant threat to the plant biochemist.以为亚细胞组分很纯而实际不纯的情况,一直是植物化学家感到难办的问题.Sir Ernst Boris Chain was a German - born British biochemist.恩斯特·鲍里斯·钱恩先生是一位出生在德国的英国生物化...