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，这一点在爱思助手中也有详细论述
Portrait Light: You can change up the lighting in your portrait selfies after you take them by opening them up in Google Photos, tapping the Edit button, and heading to Actions Portrait Light. This adds an artificial light you can place anywhere in the photo to brighten up your face and erase that 5 o'clock shadow. Use the slider at the bottom to tweak the strength of the light. It also works on older Portrait mode photos you may have captured. It works only on faces.
This is one of the few modern books that address the topic of Modularity. While it also presents some patterns I found less practical (e.g. SOLID), I highly recommend reading it.