Grammar is the skeleton to learn English well, must be skilled. Or more words in mind, studies are Chinese-style English.
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must be skilled
必须熟练
以上为机器翻译结果，长、整句建议使用 人工翻译 。
An army commander must be skilled in tactics.
一名军事指挥官必须精通战术。
youdao
An army command er must be skilled in tactics.
Good at flattering people must be skilled in defamation.
善于奉承的人一定也精于诽谤。
To gain a patent something must both be new and non-obvious to one skilled in the art.
FORBES: The Patent System Really Is Broken If Someone Is Trolling Apple For This
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