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汉语翻译

例句：

1. Laissez-faire policy result in increase economic activity, but contribute to a rise in import.
   自由放任政策导致经济活动的增加，但也促进了进口的增长。
2. And if the Johnsons seemed their own worst enemies, who is to say with conviction that the perpetual threat of homelessness did not contribute to their despair?
   如果约翰逊一家的不幸从表面上看是他们自己造成的话，那么，谁又能肯定地说他们绝望不是因为常常担心无家可归而引起的呢？
3. Does smoking contribute to lung cancer?
   吸烟会导致肺癌吗?
4. Honesty and hard work contribute to success and happiness.
   诚实加苦干有助于成功和幸福。