City officials are cracking down on illegal sub-letting in residential buildings to protect tenant rights.
Sub (下面) + let (让) = 把租来的房子再让给下面的人，即转租。
The crestfallen investors watched their portfolios shrink during the market crash.
Crest (冠/顶峰) + fallen (落下) = 孔雀开屏的羽毛垂下来了，或者公鸡的鸡冠塌了，形容颓丧。
Housing affordability remains a perennial issue in major metropolitan areas.
Per (贯穿) + enn (年) + ial = 每年贯穿始终的，即长期存在的。
The lawsuit alleges that the hospital's negligence led to the patient's severe infection.
Neg (不) + lig (选择/挑选) + ence = 没有去仔细挑选/检查，即疏忽。
The company reported a gross profit of $50 million, excluding operational costs.
Gross听起来像“格劳斯”，指“总格”的总额，还没扣除任何东西。
The report accused the firm of market manipulation through artificial trading volumes.
Mani-pu-la-tion： mani（手）+ pul（拉）+ ation。用手拉线，像木偶戏一样操纵别人。
Local residents have a significant stake in the decision to preserve the historic park.
Stake像“桩子”。你在地上打桩，说明这块地跟你有关，你有“利害关系”。
Co-housing projects are gaining popularity among young professionals seeking community and lower costs.
Co（共同）+ housing（住房）。大家一起住，共享厨房和客厅，强调社区感。
The sudden resignation of the senator came as a surprise to party leaders.
Sur-prise：Sur (类似sure确定) + prise (抓)，本来确定会发生的，突然被抓包了——意外！
The stock market staged a dramatic comeback after weeks of steep declines.
Come (回来) + back (向后)：像弹簧一样压下去再弹回来，就是东山再起。
Coalitional efforts are underway to protect coastal ecosystems from rising sea levels.
Coast (海岸) + al (形容词后缀)：海的边缘属性。想象脚踩在海岸线上，咸湿的海风扑面而来。
Local communities rallied together to rebuild after the devastating flood.
Com (共同) + mu (牛，引申为力量) + ni (你) + ti (体)：大家像牛一样一起出力，形成团体。
Scientists warn that the changing climate is accelerating the melting of polar ice caps.
Climate (气候) 听起来像 '开马特' -> 开着车去马特超市，天气变化无常。引申义：环境氛围。
The investigation remains open as detectives seek additional witnesses.
Open (打开) -> 大门敞开 -> 信息公开/问题未决。
Prominent scientists signed an open letter urging immediate action on carbon emissions.
Letter (信/字母) -> 写信需要一个个 '字母' (L-E-T-T-E-R) 拼写，最后变成 '信'。引申义：法律的字面条款。
The policy sparked fury among environmental activists who called it a betrayal of climate goals.
Fury 听起来像 '飞入' (fei ru)：愤怒得飞进来了。
Diplomatic tensions have been renewed as negotiations between the two nations stalled.
Re-newed：重新 (Re) + 新 (new) = 重新开始。
Signs of strain are showing in the coalition as cracks appear between the partner parties.
Cracks：看 (Crack) 到裂缝 (cracks) 了，房子要塌了。