紧急冷却系统有可能失灵，核反应堆有可能发生堆芯熔毁。Emergency cooling systems could fail and a reactor meltdown could occur.压缩气体经冷却凝结成液态。The compressed gas is cooled and condenses into a liquid.在发动机冷却之前不要把车开进车库里。Avoid putting your car away until ...
A cold is an infection of the upper respiratory tract.感冒是上呼吸道的感染。She produced a feminist tract, "Comments on Birth-Control", in 1930.她1930年写了篇女性主义的短文《论节育》。A vast tract of land is ready for development.一大片广阔的土地可待开发。...