stumble
vi. 绊脚 ； (说话、演奏等)出错
n. 绊脚; 出错
搭配：stumble across/on 偶然遇到，碰巧找到
1.She stumbled on a stone.
她被一块石头绊了一脚。
2.He stumbled over every sentence.
他讲每句话都结结巴巴。
3.A stumble may prevent a fall.
小惩大诫。
4.I stumble upon the rare book in a second-hand bookstore.
我在一家旧书店偶然找到这本珍贵的书。
5.And where you stumble, stop and smile, for there your treasure may lie.
你在哪儿跌倒了，停下来，笑一笑，因为那儿有你要的财宝。
substantial
adj. 坚固的; 结实的；大量的, 可观的； 重大的, 重要的；实质的, 基本的,
大体上的
1.Those workers have built many substantial buildings in the recent years.
近几年那些工人建造了许多坚固的建筑。
2.The country bought a substantial number of weapons.
这个国家购买了大量武器。
3.They made substantial changes to the arrangements.
他们在安排上作了重大变动。
4.The two stories were in substantial agreement.
这两则故事大体上一致。
5.Shall we have a light meal or substantial one?
我们吃顿便饭还是吃顿好的?
substitude
vt. & vi. 代替, 替换, 代用
1.She was dancing while someone substituted at the piano.
她在跳舞, 别人代她弹钢琴。
2. Can you substitute for the singer who is ill?
你能替代那位生了病的歌手吗？
3.They do not like potatoes , so we substitute rice.
他们不喜欢土豆，所以我们代之以大米。
suggestion
n. 建议, 意见；细微的迹象
搭配:make a suggestion 提出建议
on your suggestion 按照你的建议
用法：做建议讲时，名词suggestion后跟的同位语从句或表语从句，跟动词suggest后面跟的宾语从句一样，其中谓语动词形式也是(should)+动词原形
1.Your suggestions are unworkable.
你的建议是行不通的。
2.I detected a suggestion of malice in his remarks.
我觉察出他说的话略带恶意。
3. His suggestion went very near to resolving our dilemma.
他的建议差不多使我们走出困境。
