My grandparents will always have my gratitude for sending me money while I was in college.在我上大学期间，我祖父母经常给我寄钱，这让我一辈子都感激不尽。

gravity n.①地心引力②严肃，—本正经

It's gravity that causes an apple to fall on your head when you are sitting under an apple tree.当你坐在一棵苹果树下时，能使苹果掉在你头上的是地心引力。

We could tell we were in serious trouble from the gravity of her expression. 从她严肃的表情我们可以判断出，这次我们有大麻烦了。

greedy adj.贪婪的

George is a very greedy man. The more money you give him, the more he wants.乔治是个非常贪婪的人。你给他的钱越多，他想要的就更多。

grind vi.磨碎，碾碎

Because the diamond is the hardest naturally occurring substance, it is used in industry for cutting,grinding，and boring other hard materials.由于钻石是天然生成的最坚硬的物质，因此在工业上常用来对其他坚硬材料进行切割、磨削和钻孔。

grip v.紧握，紧抓

I gripped the railings as I walked down the stairs.我下楼梯的时候紧紧抓着栏杆。

guarantee vt.保证，担保

No one can guarantee that you will pass the exam if you don't work hard.如果你不努力学习，谁也不敢保证你能通过考试。

gymnastics n.体操；体育

Olympic arenas have been built for swimming and gymnastics.游泳和体操项目的奥运会场馆已经建好了。

halt n./vt.(使)停止

I was jolted out of my sleep by the sudden halt of the train.火车突然停止,把我从睡梦中晃醒了。

handsome adj.①英俊的；美观的②慷慨的，可观的

The handsome actor got lots of attention from the audience.那位帅气的演员得到了观众的许多关注。

After graduating with an MBA, Janet found a good job with a handsome salary.获得MBA学位之后，珍妮特找到了一份报酬丰厚的好工作。

harbor n.海港

Our city has two harbors for ships that come from the south or the north.我们市有两个港口，分别供来自南方和北方的船只停泊。