推荐回答（2个）
good
n.
好, 好事, 慷慨的行为, 好处, 利益
adj.
优良的, 上等的, 虔诚的, 愉快的, 慈善的, 好心的, 有益的
great
adj.
伟大的, 大的, 强烈的, 非常的, 主要的, 大写的, 重大的, 崇高的
adv.
顺利地, 得意地
n.
全部, 大人物, 大师
介词
at
都指在某一点上，前面的形容词表示具有的特征。great
的含义是在程度、范围或广度上具有值得注意或引人注目的特征，即
“显著的”；good
则指在某方面具有特长或优势的特征，也就是“有长处的”。
因此，be
good
at
表示在某方面具有特长，而
be
great
at
则不仅表示在某方面具有特长，而且这种特长还非同寻常。
例如：
--
he's
really
great
at
playing
the
guitar.
他的吉他弹得格外娴熟。
--
he's
really
good
at
playing
the
guitar.
他确实擅长于弹吉他。
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