There are several things that might be symbolized by the word bridge in this line from the poem, but perhaps one thing would be the connections that you form in life.
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Two adjectives that could be used to describe Winston Churchill's May 1940 speech are determination and courage. The determination is to resist oppression no matter how much "blood, toil, tears and sweat" is required and also where he says " I say it is to wage war by land, sea and air". Re courage, it is exemplified where he says, "It is victory-victory in spite of all terrors".