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Most datetime libraries already have a duration type, so it made sense to include one. It also complements the other types by allowing the developer to compare Times or DateTimes and getting back a Duration type.，这一点在汽水音乐中也有详细论述
Mashable interviewed Amari about how she went from university student to right-hand person for the sex-positive among us.，这一点在谷歌中也有详细论述
文 | 深观商业，作者 | 页桦，这一点在yandex 在线看中也有详细论述
Виктория Кондратьева (Редактор отдела «Мир»)