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88. be on a diet/be dieting: 节食
They find it hard to exercise while they are on a diet.
他们发现节食期很难进行锻炼。
89. be out of control/lose control of/get out of control: 失控
反义：under control
India’s human population has grown out of control.
印度的人口增长已经失控。
90. be indispensable to: 必不可少的，不可或缺的
Interpersonal relationships are indispensable to people's social well-being.
人际关系对人们的社交圈子而言是不可或缺的。
91. be concerned with: 考虑；关于，涉及
Fashion designers are rarely concerned with vital things like warmth, comfort and durability.
时装设计师很少考虑到保暖，舒适，耐用这类重点。
The book concerns itself with/is concerned with the effects of pollution on health.
这本书讲的是污染对健康的影响。
concern n.关心，关切
Excessive concern with safety can be dangerous.
过度关注安全是危险的。
They find it hard to exercise while they are on a diet.
他们发现节食期很难进行锻炼。
89. be out of control/lose control of/get out of control: 失控
反义：under control
India’s human population has grown out of control.
印度的人口增长已经失控。
90. be indispensable to: 必不可少的，不可或缺的
Interpersonal relationships are indispensable to people's social well-being.
人际关系对人们的社交圈子而言是不可或缺的。
91. be concerned with: 考虑；关于，涉及
Fashion designers are rarely concerned with vital things like warmth, comfort and durability.
时装设计师很少考虑到保暖，舒适，耐用这类重点。
The book concerns itself with/is concerned with the effects of pollution on health.
这本书讲的是污染对健康的影响。
concern n.关心，关切
Excessive concern with safety can be dangerous.
过度关注安全是危险的。
