granny 奶奶
Tony found a clue to the treasure. 托尼找到了一个财富的线索。
That glue is very sticky. 那个胶水非常粘。
That bell means the end of school. 那个铃声意味着放学了。
You can pick any one you want. 你可以选则想要的任何一个东西。
The deep snow may cause a problem. 厚厚的积雪可能会导致问题。

clue 线索，提示
glue 胶水
due 过期
argue 争吵
cause 因为，由于
That old blue rug is the same as mine. 那个老旧的蓝色地毯和我的一样。
We can not speak at the same time. 双方不能同时发言。
Are any book due at the library? 我有图书馆的书要还了吗？

对于

$Xa_1+a_2+a_3+a_4+a_5+a_6+a_7+……+a_n = sum_1$

$a_1+Xa_2+a_3+a_4+a_5+a_6+a_7+……+a_n = sum_2$

$a_1+a_2+Xa_3+a_4+a_5+a_6+a_7+……+a_n = sum_3$

$a_1+a_2+a_3+Xa_4+a_5+a_6+a_7+……+a_n = sum_4$

$a_1+a_2+a_3+a_4+Xa_5+a_6+a_7+……+a_n = sum_5$

$a_1+a_2+a_3+a_4+a_5+Xa_6+a_7+……+a_n = sum_6$

$a_1+a_2+a_3+a_4+a_5+a_6+Xa_7+……+a_n = sum_7$

……

$a_1+a_2+a_3+a_4+a_5+a_6+a_7+……+Xa_n = sum_n$

这一类型的方程组，可以将每一项相加，再对每一个算式做减法。

比如

$2a_1+a_2+a_3+a_4 = 6$

$a_1+2a_2+a_3+a_4 = 8$

$a_1+a_2+2a_3+a_4 = 10$

$a_1+a_2+a_3+2a_4 = -4$

可得$5a_1 + 5a_2 + 5a_3 + 5a_4 = 20，化简为a_1 + a_2 + a_3 + a_4 = 4$

再减去每一项可得$a_1 = 2,a_2 = 4,a_3 = 6,a_4 = -8$

urban 城市的
suburban 郊区的
rural 乡村
community 社区，社团
Did you hear the boy shout at the bird？ 你能听见他喊鸟吗？。
We stood in line to go to the show. 我们站成一排去看表演。
She was done before I was. 她比我先完成。
Our community is a good place to live. 我们的社区是一个居住的好地方。
They will be late if they wait any longer. 如果再晚一会儿他们就会迟到。

fold 折叠
mold 模具，霉菌（mould的美式）
subtract 减法
stage 台阶，阶段
She was a great help when I had a cold. 她在我生病时给了我很多帮助。
Subtract four from six to find the answer. 给出六减四的答案。
__They sold the house before we could buy it.__我们买下这栋房子的前提是他们卖这栋房子。
we watched the butterfly in all its stages. 我们看了蝴蝶的全部阶段。