He is merely throwing the idea forward for discussion, it is not cast in stone.
他只是抛出个想法供讨论，不是固定不变的。
It is difficult, and left behind the back to shake a coward but stepping stone bridge; also the brave forward.
困难，是动摇者和懦夫掉队回头的便桥；但也是勇敢者前进的脚踏石。
Looking forward, I have been waiting for you, the sea dry rotten stone.
往前看，我一直在等你，海烂石枯。
But it is also the brave forward foot stone.
但也是勇敢者前进的脚踏石。
But it is also the brave forward foot stone.
但也是勇敢者前进的脚踏石。
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