heavy demand floor control heavy duty dloor control
Related Translations:
繁忙: busy 短语和例子繁忙的社交应酬 the whirl of society; 繁忙的生活 a busy life; 工作繁忙 be very busy with one's work; be busily engaged; 春节前商店里十分繁忙。 the shops are very busy before the spring festival