ball point pen refill
常见例句
- 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杆、兩個筆頭、兩個筆芯和兩個筆 帽組成。筆杆有兩個平行的琯道；
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