锻造阀体已向大口径方向发展，而铸造阀体逐渐向小口径发展。

Forging body has to large diameter direction, and gradually cast body small development.

利用顶空进样、小口径毛细管柱气相色谱法测定果啤风味物质的含量。

The flavoring substances contents of fruit beer were measured by headspace sampling and small-bore capillary column GC.

记住，这实际上能替代低倍小口径的弹着点观察镜，但没法替代30倍的弹着点观察镜。

With that in mind, these actually can substitute for a very low power, small diameter spotting scope, but are no replacement for a good 30x scope.

宣东二号矿布设施工的大口径瓦斯抽放井以小口径导向钻进，后逐级扩孔成井。

Mine used small-diameter pilot drilling, then gradually reaming the borehole and finally completed to designed size.

（之后）堑壕只作为攻城战战术的一部分而存留下来，直到小口径火器以及加农炮的火力得到提升，迫使敌我双方在美国内战（1861-1865年）中再次利用壕沟作战。

Trenches remained merely a part of siegecraft until the increasing firepower of small arms and cannon compelled both sides to make use of trenches in the American Civil War (1861–65).