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。
They typically turn in well after midnight, then get up just a few hours later and barrel through the day without needing to take naps or load up on caffeine.
他们通常午夜过后才上床睡觉，几个钟头之后就起床干活，无需小憩一下或靠咖啡因提神就能度过整整一天。
The bearings are designed for very high load carrying capacity and, because they are designed with the optimum number of large barrel rollers, are also suitable for heavy loads.
轴承的设计非常高的承载能力，而且由于他们的设计的最佳一些大型每桶辊，也适用于重物。
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