poignant

adj.

尖锐的；辛酸的；深刻的；（记忆）活鲜鲜的

1. A poignant memory.
   一段悲伤的记忆。

精细化学品的催化合成:水解、氧化和还原
The shadow education system
High-efficiency CW thulium-sensitised holmium-doped fluoride fibre laser operating at 2.04 μm
Blue upconversion fluorozirconate fibre laser
Room temperature CW tunable green upconversion holmium fibre laser
Tunable CW lasing around 0.82, 1.48, 1.88 and 2.35 μm in thulium-doped fluorozirconate fibre
Ytterbium-doped fluoride fibre laser operating at 1.02 mu m
Amplification and lasing at 1.3 mu m in praseodymium-doped fluorozirconate fibres
Tunable CW lasing around 610, 635, 695, 715, 885 and 910 nm in praseodymium-doped fluorozirconate fibre
Red upconversion Yb-sensitized Pr fluoride fibre laser pumped in 0.8 micron region