The guests couldn't resist the temptation to try the cake.
Meaning: This sentence tells us that the people who were invited to the event were so tempted by the cake that they couldn't stop themselves from trying it.
Choice of Words: The word couldn't is a contraction of the words "could not". Resist means to be able to stop oneself from doing something. Temptation is the desire to do something, even though you know it is wrong or unwise. Try means to attempt to do something.
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