Question

be good at =？（短语）

Answer 1

be good at =be proficient in

be proficient in

英 [bi prəˈfɪʃnt ɪn]   美 [bi prəˈfɪʃnt ɪn]  

精通于;精通;熟练掌握...

Young people are often more qualified than senior news reporters and editors that may not be proficient in online skills.

在这点上，年轻人通常比资深新闻记者、编辑更精通这些互联网技能。

If I say hell, instant solutions to be proficient in his will encounter to evil.

我若再说自己精通医道，手到病除，必将遭来祸害。

To be proficient in English, one must be good at learning vocabulary.

在有效的英语学习中，善于学习词汇是必要的。

Answer 2

be good at = be proficient in
= have a good command of
= the master in ...
都表示“精通”、“熟练”。

Answer 3

be good at = do well in

擅长于……

Answer 4

do better in（后面跟动词ing）

Answer 5

begoodat=dowellin