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。
2
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。
3
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.