1Jackson snapped the first-ever shots of iconic landmarks such as the Tetons, Old Faithful and the Colorado Rockies on a late 19th-century expedition through the Yellowstone Basin, conducted by the head of the U.S. Geological and Geographical Survey of the Territories, Ferdinand V. Hayden.
主干主语：Jackson；谓语：snapped；宾语：the first-ever shots
结构主干为 Jackson snapped the first-ever shots。of iconic landmarks 作 shots 的后置定语，such as 引出三个并列地名举例；on a late 19th-century expedition 为介词短语作状语；句末 conducted by... 是过去分词短语作 expedition 的后置定语，the head of... 与 Ferdinand V. Hayden 构成同位语，交代指挥者身份。
译文在 19 世纪末由斐迪南·V·海登（美国领土地质与地理调查局局长）率领的黄石盆地考察中，杰克逊拍下了提顿山脉、老忠实泉、科罗拉多落基山脉等标志性景观的首批照片。
考点过去分词短语作后置定语，注意 conducted 修饰的是 expedition，不要误挂到 landmarks 上 · 同位语结构：人名在前、头衔在后（或反之）是考研高频，翻译时汉语习惯先身份后姓名
2Throughout the trip, Jackson juggled multiple cameras and plate sizes using the collodion process that involved coating the plates with a chemical mixture, exposing them and developing the resulting images with a portable darkroom.
主干主语：Jackson；谓语：juggled；宾语：multiple cameras and plate sizes
结构句首 Throughout the trip 为时间状语。using the collodion process 是现在分词短语作方式状语；that 引导定语从句修饰 process，从句内 involved 后接 coating、exposing、developing 三个并列动名词，依次描述火棉胶摄影法的涂药、曝光、显影三道工序。
译文整个旅途中，杰克逊用多台相机和不同尺寸的底片交替拍摄，采用的是火棉胶摄影法：先在底片上涂一层化学混合液，再曝光，最后用便携式暗房冲洗成像。
考点involve doing sth. 后接动名词，三个并列动名词共用一个宾语结构，注意识别并列层次 · juggle 本义为"抛接杂耍"，此处引申为"同时应付、轮换使用"，属熟词僻义
3While veterans of previous expeditions had written at length about stunning sights, these vivid photographs were another thing entirely.
主干主语：these vivid photographs；谓语（系动词）：were；表语：another thing entirely
结构While 引导让步状语从句（意为"尽管"），从句主语 veterans of previous expeditions 用过去完成时 had written，与主句一般过去时形成时间先后对照；主句中 another thing entirely 为口语化表达，意为"完全是另一回事"，强调照片与文字描述的本质差异。
译文尽管以往考察队的老手们曾长篇累牍地描写过那些令人惊叹的景观，但这些生动的照片所带来的震撼完全是另一回事。
考点while 置于句首常表让步（=although），而非时间，需结合语境判断 · be another thing entirely 为固定表达，意为"截然不同、完全是另一码事"
4Weeks after completing the expedition, Hayden collected his team's observations into an extensive report aimed at convincing senators and representatives, along with colleagues at government agencies like the Department of the Interior, that Yellowstone ought to be preserved.
主干主语：Hayden；谓语：collected；宾语：his team's observations
结构句首 Weeks after completing... 为时间状语。aimed at convincing... 是过去分词短语作 report 的后置定语；convince 的宾语 senators and representatives 被插入语 along with colleagues... 隔开，真正的宾语从句 that Yellowstone ought to be preserved 被推到句尾，形成"动词+宾语+插入语+宾语从句"的分隔结构，极易误读。
译文考察结束数周后，海登把团队的观察成果汇编成一份详尽的报告，力图说服参众两院的议员以及内政部等政府机构的同僚：黄石应当得到保护。
考点convince sb. that... 结构中，that 宾语从句因插入成分而后置，注意找回 convince 的逻辑宾语 · along with 引导伴随成分，不影响句子主干，阅读时可先跳过