As part of a special test, the school has brought the students to an uninhabited tropical island where they must now live for a week. Their performance on the test can have an enormous impact on the point standings of the four classes.
You can tell a spring's purity 
just by looking at it.
يمكنك معرفة طهارة نهرٍ بمجرّد النظر إليه
La pureza del agua
se nota a simple vista.
La pureza del agua
se nota a simple vista.
Et la pureté de la source
se voit à vue d’œil.
E per quanto riguarda la purezza dell'acqua, 
basta guardarla per capirlo.
Dá para dizer se uma fonte 
é pura só de olhar para ela.
Достаточно взгляда,
чтобы судить о чистоте ручья.