基本解釋圓珠筆芯英漢例句雙語例句The double-tube ball-point pen consists of a penholder, two pen heads, two pen refills and two pen caps, wherein the penholder is provided with two parallel tubes;本實用新型是由一個筆桿、兩個筆頭、兩個筆芯和兩個筆 帽組成。筆桿有兩個平行的琯道；ip.comball point pen refill更多例句