One cannot grasp too much at once; implying that one cannot pursue two conflicting or numerous tasks simultaneously, as it leads to inefficiency or failure.
他想同时兼顾两份全职工作，结果忙得焦头烂额，真是应了一口不能著两匙的道理。
He tried to juggle two full-time jobs simultaneously, but ended up in a frantic mess, truly illustrating the principle that one cannot grasp too much at once.
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