at the time – phrases

English	Chinese
In addition to factors that are related to geology and distance are those factors that are related directly to the design of blasting operations. The most important of these is the maximum charge weight per delay: that is, the maximum quantity of explosive that detonates at one time sometimes specified as being that which detonates within any eight millisecond period of time	除了与地质和距离有关的因素外、还有一些因素与爆破作业设计直接相关。其中最重要的是每次延迟的最大装药量、即每次要爆炸的炸药最大量有时标明为每8毫秒间隔爆炸的炸药量
Since at least the 1900s, explosives manufacturers have routinely measured time to one millionth of a second for determining the detonation rate of explosives	至少从19世纪初开始、炸药制造商业已例行测量到炸药起爆速度所用时间为百万分之一秒
The fracture frequency displayed by the cores in the vicinity of the samples was noted at the time of sampling	样品附近的岩心上显示的裂纹频率在采样时就注意到了
This is a call to undertake agriculture, forestry, husbandry, side-production and fishing at the same time	这是个农、林、牧、副、渔并举的号召