This matches the start of the string, and then the first and second optional m, but not the third m (but that's okay because it's optional), and then the end of the string.
但是第二个和第三个都不匹配(但是这是没有问题，因为它们本身都是可选的)，然后字符串就结束。
The lotion was made at U-M, but U-M will not commercialize this lotion because it was designed only for experimental purposes and, therefore, is cosmetically undesirable.
这种洗剂由密西根州大学研制，但由于它只是用于试验密西根州大学不会将它商业化，也不希望它成为化妆品。
The lotion was made at U-M, but U-M will not commercialize this lotion because it was designed only for experimental purposes and, therefore, is cosmetically undesirable.
这种洗剂由密西根州大学研制，但由于它只是用于试验密西根州大学不会将它商业化，也不希望它成为化妆品。
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