直颈 meaning in English

straight neck

Assembly tools for screws and nuts - double - headed , flat and offset , box wrenches - length of wrenches and thickness of the heads
螺钉和螺母用装配工具.双头直颈和弯颈套筒扳手.扳手长度和头部厚度
By han dynasty 206 bc - 220 ad , the instrument developed into a form of four strings and twelve frets , plucked with fingernails and known as pipa or qin - pipa
但当时的琵琶形状与现在的不同,其形状为直颈，园形音箱，音位和弦数不固定。弦数为四五六条不等