Columns of greasy black smoke rose up to stain a merciless blue sky.
股股浓烟腾上高空污染了无情的蓝天。
However, history can be both a merciless mocker and a fair judge.
然而，历史是无情的嘲笑者和公正的裁判者。
Dropping brings thousand of people to Downhill Mountain Biking. Gravity is a merciless teacher.
坠落，把数以千计的人带到山地速降运动。重力，是一个无情的老师。
Our emotions often water is such a sad merciless.
很多时候我们的情感就是这种落花有意流水无情的伤感。
Our emotions often water is such a sad merciless.
很多时候我们的情感就是这种落花有意流水无情的伤感。
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