For ten weeks, nine hours at a stretch, he carefully wrote his message with a black felt-tip marker.
花费了整整十个星期，每天九个小时，他用黑色毡尖笔小心翼翼地写下了他的留言。
All imperfections shall be identified and marked for repair with chalk or felt-tip marker.
所有瑕疵需要用粉笔或者毡制粗头笔标识以便修补。
Holidays indicated by the detector shall be marked with chalk or felt-tip marker to identify the area to be repaired.
漏涂仪显示的漏涂区域用粉笔或毡制粗头笔标识。
Aldrin relied on a felt-tip marker, since the non-conductive tip would close the contact without shorting it out, or causing a spark.
奥尔德林当时使用的是毡制粗头笔，它的尖头是不导电的，接触开关不会造成短路或引发火花。
Aldrin relied on a felt-tip marker, since the non-conductive tip would close the contact without shorting it out, or causing a spark.
奥尔德林当时使用的是毡制粗头笔，它的尖头是不导电的，接触开关不会造成短路或引发火花。
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