Be a barrel of laughs

英语翻译
This is a large section!Basically,almost any barrel with an inherent element built into it can be made to carry a second element (particularly shock barrels).Some I will list..求翻译
barrels要翻译成枪管哟

这两个词怎么读哦?acre-foot/hour kilobarrel
acre-foot/hour 读 英亩英尺/ 有“英亩英尺”这个单位吗?
kilobarrel 这个又怎么读?

请问“keep calm and do a barrel roll”的引申意思是什么啊 直译是“
请问“keep calm and do a barrel roll”的引申意思是什么啊 直译是“保持冷静,做个滚筒”,想知道它的引申义,因为这句话成了***的热门话题,所以感觉引申义一定很有意思,谢谢​

英语翻译
The fall to $101 a barrel takes the price of crude to a five-month low.

The price of oil has _________ sharply to $12 a barrel. A．risen B．raised C．been risen D．been raised

一道物理英文题
The speed of a bullet as it travels down the barrel of a rifle toward the opening is given by v = (–5.00 × 107)t2 + (3.00 × 105)t,where v is in meters per second and t is in seconds.The acceleration of the bullet just as it leaves the barrel is zero.
(a) Determine the acceleration and position of the bullet as a function of time when the bullet is in the barrel.
(b) Determine the length of time the bullet is accelerated.
(c) Find the speed at which the bullet leaves the barrel.
(d) What is the length of the barrel?

oil pierces the $70-a-barrel barrier and natural gas prices quadruples ever since the late 1990s.4563

oil pierces the $70-a-barrel barrier and natural gas prices quadruples ever since the late 1990s.4
oil pierces the $70-a-barrel barrier and natural gas prices quadruples ever since the late 1990s.
我这么翻译对吗?
语言点：
1—pierce：动词.刺穿,突破.
2—$70-a-barrel barrier .barrel：名词.桶.$70-a-barrel 70美元一桶.
barrier：名词.栅栏,障碍物,屏障.
3—oil pierces the $70-a-barrel barrier ：油的（价格）突破了70美元一桶的屏障.
4—quadruple ：动词.成4倍.
5—ever since ：从那时起.
6—the late 1990s：90年代末.
7— natural gas prices quadruples ever since the late 1990s.
翻译：从90年代末,天然气的价格达到了4倍.

The price of crude oil has jumped to almost USD.26 a barrel,up from less than USD 10 last December
这里up from less than USD 10 last December,是非限制定从么?非限制定从不是不能省略关系代词么?

KI、Drum、Gallon和Barrel之间的换算关系
这是化工中管道的一个问题，我也不知怎么弄？是不是有换算关系，