微机电系统(MEMS)是近年来兴起的一门新兴技术，微行星齿轮减速器是微机电系统中的重要器件。
Micro Electro Mechanical System (MEMS) is a course of new technology rising in recent years. Micro planetary gear reducer is the important part in MEMS.
同位素地质年代学是测量年龄，利率，和历史或行星的地质资料的一门科学，运用这些见解的过程和现象可以了解地球与行星科学系。
Geochronology is the science of measuring ages, rates, and histories of geologic or planetary materials, and using these insights to understand processes and phenomena in earth and planetary science.
一颗小行星当这位有抱负的年轻人试着宣布他的观点说一颗小行星将在来年摧毁地球时，他被协会扫出了门，这着实让他大吃一惊。
An asteroid When the aspiring young man tried to assert his opinion that an asteroid was going to destroy Earth the following year, he was astonished to be kicked out of his association.
一颗小行星当这位有抱负的年轻人试着宣布他的观点说一颗小行星将在来年摧毁地球时，他被协会扫出了门，这着实让他大吃一惊。
An asteroid When the aspiring young man tried to assert his opinion that an asteroid was going to destroy Earth the following year, he was astonished to be kicked out of his association.
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