L.f.d.
[医] 最低致死量(毒素)
🗣️ 情景例句
Well, it always worked for me, too.
嗯， 这办法对我也累试不爽。
No,I can't .
不，我不能。
There has long been a superstition among mariners that porpoises will save drowning men by pushing them to the surface, or protect them from sharks by surrounding them in defensive formation.
长期以来，海员中流传着一种迷信的说法，认为海豚会把快要淹死的人托到水面，救人性命；或在人们周围列队保护，使他们免遭鲨鱼伤害。