Femtogram
毫微微克(10的-15次方克)
🗣️ 情景例句
She couldn't get over her shyness.
她无法克服羞怯。
A friend in court is better than a penny in purse.
曩中有钱，不如朝中有友。
it may have been because curiosity attracted them and because the scent of a possible meal attracted the sharks.
那么它们可能是出于好奇；而鲨鱼可能是闻到了可以美食一顿的香味。