puts "Mary had a little lamb."
puts "Its fleece was white as #{'snow'}."
puts "And everywhere that Mary went."
puts "." * 10 # what'd that do?
end1 = "C"
end2 = "h"
end3 = "e"
end4 = "e"
end5 = "s"
end6 = "e"
end7 = "B"
end8 = "u"
end9 = "r"
end10 = "g"
end11 = "e"
end12 = "r"
# watch that prints vs. puts on this line what's it do?
print end1 + end2 + end3 + end4 + end5 +end6
puts end7 + end8 + end9 + end10 + end11 +end12使用单引号创建字符串时会忽略字符串里的变量。