Any of several grayish brown mammals with soft fur, rudimentary eyes, and broad feet with which they dig long underground burrows.

【动】鼹鼠。

A dark-colored spot or growth on the skin.

黑痣。

A massive breakwater, as at the mouth of a harbor.

堤道；防波堤。

The base unit of amount of pure substance in the International System of Units that contains the same number of elementary entities as there are atoms in exactly 12 grams of the isotope carbon 12. The number is 6.0225 × 10²³, or Avogadro's number.

【理】【化】莫耳。在十二公克的同位素碳十二中所含的碳原子数，亦为亚佛加厥常数(6.0225 × 10²³)。