chi_char = open(chinese_file,'r',encoding='UTF-8').read()
include = set(string.printable+all_chi_char)

full_text = open(source_file,'r',encoding='UTF-8').read()
output_text = ''.join(ch for ch in full_text if ch in include)

chi_char = open(chinese_file,'r',encoding='UTF-8').read()
include = set(string.printable+all_chi_char)

full_text = open(source_file,'r',encoding='UTF-8').read()
output_text = ''
for ch in full_text:
    if ch in include:
        output_text += ch