verb + upstream
upstream 修饰动词，表示动作方向逆流。
Salmon swim upstream to spawn.
鲑鱼逆流而上产卵。
逆流而行；向源头；逆流；逆流地
逆流而行
Against the current.
向源头；逆流
toward the source or against the current
The fishermen rowed upstream to reach their favorite fishing spot.
渔夫们逆流划船，到达他们最喜欢的钓鱼地点。
用法提示：此处 upstream 是副词，修饰动词 rowed，表示“逆流地，朝上游”。
Every spring, salmon swim upstream to lay their eggs in the same river where they were born.
每年春天，鲑鱼逆流游回它们出生的那条河里产卵。
用法提示：upstream 作副词修饰 swim，说明动作的方向是“朝上游”。
It took the boat crew three hours to travel upstream against the strong current.
船员们顶着强流，花了三个小时逆流航行。
用法提示：upstream 作副词修饰 travel，表示“逆着水流方向”，并与 against 短语搭配使用。
upstream 修饰动词，表示动作方向逆流。
Salmon swim upstream to spawn.
鲑鱼逆流而上产卵。
用于描述位置，相对于水流方向。
The factory is located upstream of the river.
工厂位于河流的上游。
也可用 from 短语指明起点。
They paddled upstream from the village.
他们从村庄逆流划船而上。
grammar · medium
易错句子We need to go to upstream.
正确表达We need to go upstream.
upstream 是副词，直接修饰动词 go，不需要介词 to。
grammar · medium
易错句子The fish swims upward.
正确表达The fish swims upstream.
upward 表示向上移动，而 upstream 特指逆流而上，在河流语境中应使用 upstream。
upstream 指逆流而上，downstream 指顺流而下，方向完全相反。
upstream 指向河流上游方向（水中），uphill 指向山坡上方（陆地），介质不同。
逆流而游；溯流而上
Salmon swim upstream to reach their spawning grounds.
鲑鱼逆流而上到达产卵地。
向源头行进；溯流而上
They traveled upstream by boat.
他们乘船溯流而上。
洄游到上游
These fish migrate upstream every spring.
这些鱼每年春天洄游到上游。
向上游流
In this section, the tide causes the river to flow upstream briefly.
在这一段，潮汐使河水短暂地向上游流。
艰难地向上游推进
The explorers pushed upstream through the dense jungle.
探险队穿越茂密丛林艰难地向上游推进。
up-（向上/逆着，同前缀词：uphill、upgrade） + stream（水流/河流，同根词：mainstream、stream）。副词，表示逆着水流方向。
逆流而上；逆势而为
In a company that values conformity, she often has to swim upstream to propose new ideas.
在一家崇尚一致的公司里，她常常不得不逆势而为去提出新想法。
追溯源头；逆流而上去寻找根源
The team went upstream to find out why the product pipeline kept failing.
团队追溯到源头，想弄清楚产品管道为何不断失败。
发长 /iː/ 音 (如 sea, tea)
Same pattern, same sound
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