And it's because there's no one. It's all upbeat.

因为有它一样都是弱拍曲子。

There would be two weak beats or two unstressed beats between each strong beat.

会有两个弱拍或者说是非拍存在于每个拍间。

Musicians clearly preferred versions with synchronized offbeats and these very slightly delayed downbeats.

音乐家们显然更喜欢同步弱拍和拍延迟非常轻版本。

In another, there were very slight soloist delays on both downbeats and offbeats.

在另一个版本中，独奏者演奏拍和弱拍时有非常轻延迟。

Swing rebels against a straight 50–50 meter with a prolonged first beat, or downbeat, and a shortened second beat, or offbeat.

摇摆乐反对连续而平衡节拍，而是采取延长第一拍（拍），以及缩短第二拍（弱拍）。