Martha's approaching her century and as wick as a flea.

玛撒快满岁了，却敏捷得像只跳蚤。

I'll put a flea in his ear if he bothers me once more.

果他再来打扰的话, 我就要对他不客气了。

My friend likes to stroll around the flea market on the chance of picking up something of value.

"我的朋友逛旧货市场,希望能找到点有价值的东西。"

When he came to ask for his job back, we sent him away with a flea in his ear.

他来要求复职，结果被我们给轰走了。

Fleas are parasites.

跳蚤是寄生虫。

" Water flees fleas" are not insects but copepods, a crustation crustacean like lubster lobsters and crubs crabs but extremely small.

水蚤不是昆虫类而是桡脚类的动物，像龙虾那样有甲壳的，但是非常小的。

Several distinct rickettsiae (a parasite carried by ticks, fleas, and lice) cause a disease known as typhus in humans.All cause disease with similarities of fever, headache, and rash.

由几种不同的发疹伤寒病原体（可由壁虱，跳蚤，虱子等寄生虫传播）引起的疾病被人们称为斑疹伤寒。