authentic act

例句：

1. 1. The painting is authentically by the artist's hand.
   这幅画是艺术家亲手绘制的。
2. 2. He was accused of being authentic, but his story was later proven to be false.
   他被指控是真诚的，但他的故事后来被证明是假的。
3. 3. The company's products are authentic and of high quality.
   该公司的产品真实可靠，质量上乘。