Shape trimming: from invisible to tangible, step by step subtraction, the shape shape first trimmed out.

Skulling: two sides of the knife, combined with the head and tail, the middle of the unwanted melon skin removed.

Scraping: here first use the tip of the knife to draw a line in the melon skin as an outline, just like holding a pen in the drawing, only carved the green skin, not carved to the white flesh. With the outline is good to scrape the green.　　Line: the lower half of the knife, the left and right cater to each other, the line came out naturally.