A hydrocarbon was known to be either an alkene or alkane.某碳氢化合物已知可能是烯烃或是烷烃.The hydrocarbon must be an alkene.这个碳氢化合物必定是烯烃.The betaine will collapse to the alkene only when these two functions are eclipsed.只有当这两个基团移至重迭位置时...
Boy, did this woman know how to put a dampener on your day.天啊，这个女人可真会让人扫兴。Admittedly, the recession has been a bit of a dampener.诚然经济萧条已经逐步在减弱.The incident put a dampener on his birthday party.这件事使得他的生日晚会很扫兴.He used a da...
有时这些碳棒包上一层铜,以增加其导电性.Sometimes the carbon rods are copper coated to improve electrical conductivity.当定购这种硅碳棒时,提供额定电阻是非常重要的.It is important to provide the nominal resistance when ordering.这种硅碳棒的连桥结构正是在此基础上去除了任何焊接部分.The Ele...