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.
Then read the day to learn the words, sentences, dialogue or text, must be skilled.
然后朗读当天学习的单词、句型、对话或者课文，必须要熟练。
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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