..., from DVDs to satellite communications to bar codes - any area, in short, where data has to be conveyed rapidly yet accurately. 问题:本句的阴影部分的语法结构是什么?①“,from DVDs to satellite communications to bar codes”是插入语吗?②破折号起到什么作用?...
For the first time in seven years, New York City officials expect the number of foreign visitors to decrease, a drop they attribute to the protectionist policies and rhetoric of President Trump—saying that those moves are scaring off many of visitors who have helped fuel the city’s robust growth...
On going into the kitchen,I turned on the light because it was dark.In winding itself round the wires,the snake had send sparks to the ground and this caused the fire.这两句话逗号前是状语从句吗,在现在分词前为什么要加一个介词,可以去掉吗?