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directly; in person; firsthand
「直に」 has another reading with different meanings.
社長と直に話す貴重な機会を得た。
I got the chance to talk directly with the company president.
直に見ないと分からないことがある。
There are things you can't understand without seeing firsthand.
直に肌で感じる体験が大切だ。
Direct, firsthand experience is important.