doddering old age老态龙钟
The research of allelopathy of bermudagrass is still not enough, this paper focused on the effects of allelochemicals and aqueous extracts of bermudagrass on seed germination and seedling growth of alfalfa and dodder.
目前国内外对狗牙根化感作用的研究还比较少,本文着重研究了化感物质与狗牙根浸提液对受体植物苜蓿和菟丝子种子萌发及幼苗生长的影响作用。
参考来源 - 化感物质与狗牙根浸提液对苜蓿和菟丝子种子萌发及幼苗生长的影响ADJ（形容词） If you refer to someone as a doddering old man or woman, you are saying in a disrespectful way that they are old and not strong. 老迈的 [usu ADJ n] [表不满]
...a doddering old man making his will before he's too senile.
...一个老迈的男人在他过于衰老前立下了遗嘱。