You'll notice that at first the engine "smokes" on decel, this is normal, as the rings haven't sealed yet.

刚开始，你会看到发动机冒黑烟，这很正常，是因为密封环还没有完全密封的缘故。

youdao

You'll notice that at first the engine "smokes" on decel, this is normal, as the rings haven't sealed yet.

刚开始，你会看到发动机冒黑烟，这很正常，是因为密封环还没有完全密封的缘故。

youdao