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1.string v.用线串(to tie, hang, or fasten with string)：n．弦(cord)；一串(a group of objects threaded on a string)
联想记忆：st+ring(铃)--路上留下一串串清亮的铃声--一串
例:The jewelry maker strung beads to make a necklace.//guitar strings吉他琴弦//DNA strings基因链
2.stringent a．严格的(strict)；严厉的(rigid)
例：The Wildlife Protection Committee imposed more stringent penalties on poachers.
派生词：stringently( ad.严格地，严厉地)
3.strip v.剥去(to remove surface matter from);n．狭长的一片(a long narrow piece)
联想记忆：s《音似：死）+trip(旅行)--死亡剥夺了人在尘世的时间之旅--剥去
例：The only place where the wild form of emmer wheat has been found growing is a relatively narrow strip of southwest Asia.
派生词：stripy(a．有条纹的)
4.strive v.努力，奋斗(to endeavor)
词根记忆：striv(竞争)+e--不断迎接竞争--努力，奋斗
例：The directors of large firms will strive to reduce the costs of their products.
5.stroke n．中风(sudden attack of illness in the brain that can cause loss of the power to move, speak clearly, etc.)；击(blow)．敲（钟）(act of striking, esp. of a bell);一下完成的动作(a single unbroken movement)
例：Hypertension(高血压)can cause strokes.//at one stroke一下子，突然
6.stroll v./n.闲逛，散步(to go for a leisurely walk)
联想记忆：St+roll(摇摆，滚动)--摇摇摆摆地去散步--闲逛
例：David strolled through the woods behind his house.
7.strut n．支柱，支撑（a structural piece designed to resist pressure）
例：In birds the second finger is the principal strut of the wing.
8.studious a．慎重的；有意的(deliberately or consciously planned)
例：studious criticism 慎重的批评//The study(书房)was furnished with studious simplicity.
9.stumble v./n.绊倒(to trip)
例：a stumbling block 绊脚石
vi. 奋斗，努力，力求
