своим ходом
Under one's own steam/power, on one's own (двигаться); at one's own pace, (to take) its course (развиваться)
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Полный русско-английский словарь
на Gufo.me
Under one's own steam/power, on one's own (двигаться); at one's own pace, (to take) its course (развиваться)