skilled
a.熟练的，有技能的；需要技能的
辨析：skilled通常指受过正规训练，有多年实践经验，从而掌握某项专门技术；skillful指人聪明，做事很灵巧，尤指手的灵巧
1.Don't quarrel with your tools. You are not a skilled worker.
不要抱怨你的工具差，你不是一个熟练的工人。
2.We are going to set up a special education center to train skilled worker
and specialist of higher qualification.
我们打算建立一个专业教育中心来培训高级技术工人和专业人员。
slack
adj. 松(弛)的;清淡的, 不活跃的; 懈怠的, 马虎的
vt. & vi. 懈怠; 偷懒;减速; 放松
n. (绳索等)松弛部分;宽松裤
1.He tightened a few slack screws.
他旋紧了几只松动的螺丝。
2.Winter is the slack season at most hotels.
对大多数旅馆来说, 冬天是淡季。
3.Living alone, he became slack about his appearance.
由于单独过活, 他对自己的外表越来越不在意了。
4.Haas slacked off in his work.
哈斯工作很懈怠。
5.His pace has gradually slacked.
他的步速逐渐慢了下来。
6.He pulled in the slack of the rope.
他收紧松垂的绳索。
7.I put on a pair of golfing slacks.
我穿上了一条高尔夫球宽松裤。
slip
vi. 滑, 滑倒
vt. 偷偷[悄悄]地塞给;摆脱, 挣脱; 逃过; 被遗忘, 被忽视
n. 滑, 溜, 滑倒; 小过失, 失误
搭配：let slip 偶然泄露（秘密等）
slip up 失误，出差错
辨析：slide，glide是有意地滑，平稳而顺畅地滑行
slip是不自主地滑，滑动
比较：slip on the ice 在冰上滑倒；slide on the ice 滑冰
1.Passers-by would slip the beggar some change as they passed.
过路人从那乞丐身边走过时, 总会塞给他一点零钱。
2.The dog slipped its collar and ran away.
那条狗挣脱了项圈逃走了。
3.Your name has slipped my mind.
你的名字我忘了。
4.One slip and you could fall off the building.
脚下一滑就可能从建筑物上跌下去。
5.There are a few trivial slips in this lesson.
在这篇课文中有几个小错误。
split
vt. & vi. (使)裂开; (使)破裂
搭配：split up 断绝关系，离婚，划分
辨析：split被撕裂，裂开，常指服装、木材的裂开
break断裂，常指完整的东西被打破或断裂
crack爆裂，破裂，常用于指硬的、易碎的或空心的东西，常伴随有突然的声音
snap 突然折断，指迅速地，干脆利落地折断，尤指折断脆弱的东西，伴有刺耳的声音
1.The wood splits easily.
这木头容易劈开。
2.Together or split?
一起结账还是分开结账呢？
3.After the meeting we split up and went home.
散会以后，我们就分手回家了。
4.John has just split up with his girl friend.
约翰刚刚跟女朋友吹了.
