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Question:

please tell me the meanings of these idioms?

to have an axe to grindto have a bee in one's bonnet to hit below the belt to be a wet blanket to have a bone to pick with someoneto draw the long bowto make a clean breast of itto take the bull by the hornsto puddle one's canoeto put the cart before the horseto be under a cloudto keep it darkto be a dog in a mangerto make both ends meetto have a favor in one's capto show the white featherto play second fiddleto burry the hatched

Answer:

People who've been exposed to loud, dangerous sounds like 'bombs bursting in air' tend to be jumpy. It's a very good practice to shout:' LOUD NOISE' before making any sudden sound. Veterans thank you.
It is less a question of covalency than of bond strength. Carbonic acid is pretty benign stuff; the Coca-Cola company has been making money from it for a century. But drinking hydrochloric acid will give you a bad day: unlike carbonic acid, which is only mildly ionized, hydrochloric acid is fullly ionized, and all of those ions are running around looking for something to react with.
there are different casting resins, but e.g. Michaels sells one. I would think Hobby Lobby and other similar craft stores will have some too. If you want some specific product you might have to order online.

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