The 4-inch-diameter plastic balls block sunlight from penetrating the 175-acre surface of the reservoir.
这些塑料球直径为4英寸，覆盖了水库175英亩（约71公顷）的水面，使其避免太阳光照射。
Find some glass or plastic balls (enough for everyone in your family). Using a metallic marker write your name across the front and the year on the back.
你可以找一些玻璃球或塑料球(够每个家庭成员使用即可)，再找一只记号笔把每个人的名字写在球的正面，背面写上年份，然后再画一个简笔树或雪花就完成了。
Plastic buckets and balls roll around in the breeze.
塑料小桶和沙滩球在海风的吹拂下四处滚动。
But it's a big improvement over some of the makeshift balls the kids create from things like old plastic bags.
但是与孩子们用旧塑料袋这样的东西制作的代用足球相比，已经有了一个大的进步。
Your bunny will enjoy lots of toys to play with, such as untreated wood, straw, wire cat balls, keys, paper towel rolls, and hard plastic baby toys.
你的兔子会很热衷于玩具，诸如天然木头，稻草，逗猫球，钥匙，纸团，和硬塑料儿童玩具。
The balls on one hoop are heavy brass, those on the other are lightweight plastic.
一圆环上的球是很重的黄铜球，另一圆环上的则是轻的塑胶球。
The scientists say water drops form small balls on the new plastic.
科学家说，水滴在新型塑料上形成小球。
Bowling balls have advanced immensely over the past decade alone. Before the 1990's, the only types of bowling balls available were urethane, plastic, and rubber.
保龄球在过去的10年间有了巨大的进步，1990年以前，球的材质仅限于优力胶、玻利及橡胶。
Bowling balls have advanced immensely over the past decade alone. Before the 1990's, the only types of bowling balls available were urethane, plastic, and rubber.
保龄球在过去的10年间有了巨大的进步，1990年以前，球的材质仅限于优力胶、玻利及橡胶。
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