The introduction of rifling, or cutting grooves, into a barrel had already improved accuracy, but the weapons remained difficult to load and clean.
人们将来复线（膛线）引入枪管之后提高了射击的精确度。 但是装弹和清膛仍然很麻烦。
He added: "Strengthening the methods for early diagnosis of cancer, as well as improved treatments, will have a significant impact on cutting death rates."
他还说：“强化癌症早期诊断方法，改进治疗手段，对于减少癌症死亡率大有裨益。”
Again, improved efficiency confers great benefits in the longer term. However, to the extent that firms are able to find further cost-cutting measures as output expands, they may delay hiring.
提高效率赋予了企业长远而巨大的好处，但是，只要企业在提高产出时能够找到进一步削减成本的措施，他们可能会延迟聘用新员工。
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