我们必须马上出发。
We must start at once, or we shall miss the plane.
我们必须立即出发，否则就赶不上飞机了。
We must start at once or we can't get there on time, can we?
我们必须马上出发，否则我们将不能按时到达那里了，对吗？
We must start at once or we can't get there on time, can we?
我们必须立刻出发，否则不能准点到，是吗？
We must start at once to expand it and to secure our communications to it.
我们必须迅速使之开始扩充，并确保到达该地的交通线。
We must start at once to expand it and to secure our communications to it.
我们必须迅速使之开始扩充，并确保到达该地的交通线。
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