首 (shǒu) means “head; chief; first (occasion, thing etc); classifier for poems, songs etc”. It is an HSK 5 Chinese character in the HSK 3.0 vocabulary.
这件事我首先要考虑清楚。
Zhè jiàn shì wǒ shǒuxiān yào kǎolǜ qīngchu.
I must first think this matter through clearly.
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