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into two matching parts . . . and from them arose husband and wife. . .
. and from their union arose the human beings of the earth. . . . She
changed to a cow . . . he changed to a bull</span>
Meager means scarce, in that there was not much available for them to eat. Therefore, they were starving and desperate for the next town to stock up.
They must allow Hitler to believe he has defeated them, and then attack.
They had to reform the Red Army and the Russian air force.
They used camouflage, surprise and misinformation to keep the German army in the dark about their intentions. The retreated Soviets were ordered by Stalin to leave nothing the Germans could use, this was called a scorched-earth policy.
Remaining healthy in Elizabethan England was a challenge.
This is the central idea of the passage. We know this because it says, "there is no concept of 'health and safety'. Other details that reveal this as a central idea are "contemporary standards of cleanliness will worry you", "People die every day from unknown ailments", and "Infectious diseases periodically kill thousands". This all shows that remaining healthy in England was a challenge.
Thoreau's Walden is about nature and its superiority to the civilized world. Hence his imagery implies the authenticity and vividness of nature, as opposed to the superficial and artificial edifice of humanity and civilization. Imagery appeals to human senses, and the reader gets a feeling that the described phenomenon can be touched, heard, seen, smelled - which conveys a colorful and profound view of nature, as something that is far from mere abstraction. Nature is, in fact, a genuine part of us that we can immerse in and enjoy with the whole of our being. For example, "the wood thrush sang around, and was heard from shore to shore" is an auditory imagery - we can almost hear the thrush's song and its echoing. A visual imagery can be seen in "<span>shallow and darkened by clouds, the water, full of light and reflections" - there are nuances of colors and meanings in this passage, which imply the ever changing and ever evolving nature of the landscape, which seems to have a life of its own.</span>