Why did Thales say the water is the originating principle, according to Russell?

If I remember correctly the short history of Russell's Western philosophy, Russell claimed that it was a philosopher first recognized by Thales. He said:

Russell did not explain in detail why he held this view, he said that he is most likely to think that water is a "primitive" principle. Indeed, there is evidence that Thales made this claim only in Aristotle's metaphysics, Aristotle then guessed what he meant.

All that exists there, what it turns to and what it will ultimately exist, its essence still exists under it, but what they say is that elements of things and what they say It is a principle. ... It is the purpose of being preserved, from there there are some natural (φύσις), since there is more than one ... the founder of this philosophy of Thales says it is water

In other words, it is almost the same as our material concept; later philosopher Anneximenes chose air instead of water (in particular this is two of the four elements)

Why did Russell choose water as a "primitive" principle rather than the "materialistic" principle, especially since then, the material theory has been formulated and in fact there are two contradictory explanations. Do you explain? If he has never read Aristotle, or if he is working from a bad translation (assuming he has few Greek words)

The general assertion of Aristotle's first thinkers who conquered nature (and his concrete discussion of Thales's dependence on the water as the first principle) made it difficult to explain the early democrats did. According to Aristotle's general statement, Presocratics claims that there are persistent materials that are both the origin of all things and their continuing nature. Therefore, according to this view, when Thales said that the first principle is water, he should be understood to assert that the original state of things is water. But when I proposed what Aristotle could provide to Thales, he just suggested Thales, water is the first principle since everything comes from water.

Thales' cosmological Maxim claims that water is all the basic element (main principle). The idea that the whole world comes from water is an example of material monism (almost the same view that all of the world after Anaximenes consists of air). According to Aristotle, Thales explained his theory by analyzing the principles of biology. In the biological world, Tales has three things: Tallace believes that water is the origin of everything, everything will appear and everything will be returned, and he will make things finally I believe it is water. Aristotle explained in his "De Caro" that "his faith is ours and that of Thales of Miletus is the oldest explanation."

Aristotle has speculated that Thales has reached a conclusion by thinking that "nutrients of all things are damp, and even heat is created by humidity." Aristotle's guesses about why Thales uses water as a principle of substance origin is his own thought but he is aware of Thales's early materials and formalism Person. The doctrine of Thales says that water is the origin of things, everything is in it, everything resolves this. He tried to argue the truth