行不通英语怎么说

那个消除铜助剂的纯度提高我们的产品显着，但反应时间增加最多一周的情况替代。彻底消除氧在三乙胺的解决方案被证明是至关重要的。其存在显然打乱了催化循环氧化钯（0），以钯（ii），然后带来了氧化偶联的双端炔。最好的钯催化剂（三苯基膦）4，主要是因为它不需要减少的一步激活。与钯（ii）催化剂，我们总是发现副产品载butadiynes甚至完全脱气后的解决办法

The proposal/s made during the meeting was/were not feasible, thus it/they was/were turned down by others.

then fluffing it up at the back

Your plan doesn't work!或是Your plan is impractical.

the suggestion put up with in the meeting couldn't work, therefore, it was refused by others.

The advice I gave on the meeting was shut down ,which led to the rejection from others

Your plan won't work 用将来时好点吧