它有双面，两侧边缘都很锋利，而且相当对称。
It's double-sided, it has a sharp edge both sides, and it's symmetrical.
刀锋的厚度仅相当于80个原子，即发丝直径的五千分之一到一万分之一左右，比市场上的普通刀片要锋利非常多。
They are just 80 atoms thick on their cutting edge - around 1/10,000th or 5,000 times thinner the width of a hair and far sharper than any of common blades on the market.
另外，刺鳐的尾部还有一根锋利有毒的尾刺，可以用来恫吓潜在的威胁者，其致命一击的能力甚至让人类也感到胆寒，不过这种攻击案例极为罕见，它们的性格相当温顺，只有在被挑衅时才会进行反击。
The barb can deliver a lethal blow even to humans, but incidents are extremely rare. Stingrays are fairly docile and typically strike only when provoked.
所以他不多不少恰恰打了八次，利用其他石头来打磨它，敲掉一小薄片，留下这边面几乎呈现直线，边缘相当之锋利。
One, two, three ... three times at the other ... so eight specific actions by him, knocking it with another stone, to take off a flake, and to leave this almost straight line, which is a sharp edge.
它没有锋利及其相当模糊和不确定。
It had no sharp edges and its was rather fuzzy and undefined.
它没有锋利及其相当模糊和不确定。
It had no sharp edges and its was rather fuzzy and undefined.
应用推荐