钢琴有两种类型的键，白键和黑键。
Piano has two types of keys, the white keys, and the black keys.
生活就像一架钢琴：白键是快乐，黑键是悲伤。但是，要记住只有黑白键的合奏才能弹出美妙的音乐。
Life is like a piano. The white keys are happy days and the black keys are the sad ones. Just remember you need both to make music.
生活就像一架钢琴：白键是快乐，黑键是悲伤。但是，要记住只有黑白键的合奏才能弹出美妙的音乐。
Life is like a piano: white keys are happy moments and black keys are sad moments. But remember both keys are played together to give sweet music.
生活就像一架钢琴：白键是快乐，黑键是悲伤。
Life is like a piano: white keys are happy moments and black keys are sad moments.
选择渐变工具（快捷键“G”），设置一个白-灰-白的渐变，如下图。
Then grab the gradient tool (shorcut ‘G’ on the keyboard) and setup a white to gray to white gradient like the one referenced below.
选择渐变工具（快捷键“G”），设置一个白-灰-白的渐变，如下图。
Then grab the gradient tool (shorcut ‘G’ on the keyboard) and setup a white to gray to white gradient like the one referenced below.
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