Each depth level has its own cutoff flag (\ifmm@cutoffB, \ifmm@cutoffC, \ifmm@qcutoff), which are TeX booleans declared with \newif at the top level (declaring them inside a macro causes a “already defined” error on the second call).
for ext, size in ext_sizes {
，这一点在新收录的资料中也有详细论述
It is a live vaccine which means it contains a weakened version of the chickenpox virus. As such, it is not recommended for those with a compromised immune system because of an illness like HIV or as a result of treatment such as chemotherapy.。新收录的资料是该领域的重要参考
（五）多次发送淫秽、侮辱、恐吓等信息或者采取滋扰、纠缠、跟踪等方法，干扰他人正常生活的；。新收录的资料是该领域的重要参考