一、语法结构剖析
1、找出谓语动词
But exposure times were much quicker by the 1880s, and the introduction of the Box Brownie and other portable cameras meant that, though slow by today's digital standards, the exposure was almost instantaneous.
2、划出句子结构
But exposure times were much quicker [by the 1880s], and the introduction of the Box Brownie and other portable cameras meant that, [though slow by today's digital standards], the exposure was almost instantaneous.
[主干]But exposure times were much quicker by the 1880s, and the introduction of the Box Brownie and other portable cameras meant that...“但是到19世纪80年代曝光时间已经变快很多了，并且“盒式布朗尼照相机和其他便携式相机的推出意味着”
|--[让步状语]though slow by today's digital standards“虽然比今天的数字标准要慢”
|--[宾语从句]the exposure was almost instantaneous.“曝光几乎是即刻的。”
二、词汇含义
Box Brownie 柯达公司在1900年推出的一款经典盒式照相机，它因为价格便宜、操作简单，让摄影从专业领域走进了普通人的日常生活 。你可以把它理解为那个年代的“傻瓜相机”，普通人买得起也用得会
portable 便携式的
instantaneous 瞬时的
三、“得意忘形”
但到了19世纪80年代，曝光时间已经快得多了，而“盒式布朗尼”相机和其他便携式相机的问世意味着——尽管以今天的数码标准来看仍显缓慢——当时的曝光几乎已经达到了瞬时完成的程度。