Elinor - your additional information cleared up the origin of your quote. It's not by Socrates at all; it was made by his contemporary, Protagoras. The version posted on your website is the one used by Diogenes Laertes >
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Diogenes' Lives of the Philosophers is probably our single most extensive source for many early Greek philosophers' works and biographies. Unfortunately, his work was compiled over six hundred years after Protagoras' death and is an uncritical compilation of materials from a wide variety of sources, some reliable, some not, and many hopelessly garbled
http://www.utm.edu/research/iep/p/protagor.htm
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> but from other sources we know Protagoras to have made statements with the general sense:
"Time rules everybody including the gods. Chance governs all human events, but its effects can be mitigated by skillful application of the arts."
That's the meaning of your text; should be clear enough to be translated into Chinese.