欢迎来到天天文库
浏览记录
ID:42153309
大小:162.11 KB
页数:3页
时间:2019-09-09
《雅思写作课件-xyh-流程图-蚕》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、LifecycleofthesilkwormSelectBoilUnwindTwistProductionofsilkdothWeaveThediagramsillustratethemainstagesinthelifecycleofsilkwormandtheprocedureofsilkclothmaking.Inthefirststage,eggsareproducedbythemothandittakestendaysforeacheggtobecomeasilkwormlarvathatfeedsonmulberryleaves・Thisstagelasts
2、foruptosixweeksuntilthelarvaproducesacocoonofsilkthreadarounditself.Afteraperiodofaboutthreeweeks,theadultmothseventuallyemergefromthesecocoonsandthelifecyclebeginsagain.Whenitcomestotheproductionofsilkcloth,oncethecocoonsareselected,theyareboiledinwaterandthethreadscanbeseparatedintheun
3、windingstage・Eachthreadisbetween300and900meterslong,whichmeanstheycanbetwistedtogether,dyedandthenusedtoproduceclothintheweavingstage.Overall,thediagramsshowthatthecocoonsarenecessaryrawmaterialsusedforsilkclothproduction.
此文档下载收益归作者所有