2 sentences

1. 它只取决于观察者的运动。

   tā zhǐ qǔ​jué​yú guān​chá zhě de yùn​dòng.

   It only depends on the motion of the observer.

   Source: OpenSubtitles

2. 观察者总是会改变被观察者的行为。

   guān​chá zhě zǒng​shì huì gǎi​biàn bèi guān​chá zhě de xíng​wéi.

   The observer always changes the behavior of the observed.

   Source: OpenSubtitles