photo变成复数

photo的复数形式是photos。
以 o 结尾的名词，有些加词尾 -s，有些加-es，有些加-s或-es均可：
piano / pianos钢琴 tomato / tomatoes西红柿 zero / zero(e)s零
例句：
1.He handed each of them a page of photos.
他给他们每个人一版照片。
2.Photos taken by compact cameras are often dark because they're slightly underexposed.
袖珍相机所拍的照片往往比较暗，因为存在轻微的曝光不足。
3.The photos caused a storm when they were first published.
照片最初刊登出来时曾引起了一片公愤。