(ér) and; as well as; and so; but (not); yet (not); (indicates causal relation); (indicates change of state); (indicates contrast)
(érbùxū) without needing (to so sth)
(érqiě) (not only ...) but also; moreover; in addition; furthermore
(érjīn) now; at the present (time)
(éryǐ) that's all; nothing more
(érhòu) after that; then
(érshì) rather
(érlìzhīnián) aged thirty (see 三十而立)
(éryán) with regard to (preceding phrase)