When it became serious he was playing up to eight hours a day.
严重的时侯，他每天最多打八个小时游戏。
He smiled briefly, and then his face became serious.
他淡淡一笑，然后他的脸严肃起来。
While he was in America, his tuberculosis became too serious to be further ignored.
他在美洲期间，他的肺结核病变得更加严重，到了不容再忽视的地步。
He also became more serious about his music.
他也对儿时热衷的音乐更为严肃。
He also became more serious about his music.
他也对儿时热衷的音乐更为严肃。
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