strong: may imply power derived from muscular vigor, large size, structural soundness, or  intellectual or spiritual resources: a ~ desire to succeed.     （vigorous活力，指能够长时间地活动，健壮鲜活undepleted and undiminished capacity for activity, robustness and freshness, 如still vigorous and sharp in her seventieth year她70岁时仍然敏锐有活力)  


stout: suggests an ability to endure stress, pain, or hard use without giving way: wear ~ boots when hiking.   （give way=yield表示物体在压力下变形或人在压力下让步，如a mattress that yields to pressure垫子在压力下变形）   结实的靴子


sturdy: implies strength derived from vigorous growth, determination of spirit, or solidity of construction: people of ~ independence.


stalwart: suggests an unshakable dependability and connotes great physical, mental, or spiritual strength: ~ supporters of the environmental movement.


tough: implies great firmness and resiliency: a ~ political opponent.   resilient指有韧性弹性，外力折不断，能恢复原状。tough表示强韧firm and resilient，既结实又有韧性，特朗普有本书叫time to get tough,他对中国的态度可以用tough形容


tenacious: suggests strength in seizing, retaining, clinging to, or holding together: ~ of their right to privacy.     (tenacious坚持to hold onto something like a dog with a bone像狗紧咬骨头一样不放，可以指坚持要求或理想目标。这个词来自词根TEN表示抓to hold，如tenable站得住脚的，tenure任期、终身教授，tenant房客，lieutenant副手中尉，tenet主旨，都来自这个词根"抓"）


strong强壮强大: 指有力量，如肌肉发达身体健康心志坚强，stout结实: 表示能承受压力痛苦、耐用不变形，sturdy坚强: 指身体结实意志坚强，stalwart坚定: 表示坚定不动摇，具有强大的身体思想精神力量，tough强韧(褒): 指既坚强又有韧劲，tenacious紧紧坚持: 指用力抓住不放  


记忆方法: 1）首字母SSSSTT想成试试他<==是否坚强

         2）练习一下

         3）坚强的意思是有抵抗力承受力mean showing power to resist or to endure.首字母SSSSTT想成试试他<==是否坚强