使用牙刷去除牙垢很有帮助.The use of a toothbrush to keep tartar down is very helpful.除牙垢用带尖工具除去牙齿表面的 ( 污垢 )To remove ( tartar ) from tooth surfaces with a pointed instrument.我的牙齿上有许多牙垢.I have a lot of tartar on my teeth....
I got quite a lot of ribbing from my team-mates.队友们经常开我的玩笑。They were persuaded onstage for a laugh by their mates.他们被同伴们说服，上台一乐。No blabbing to your mates!不要告诉你的同伴！...
It is undeniable that the economic picture is brightening.不可否认经济状况正在好转。He had undeniable charm.他具有不可否认的魅力。That all great art has this power of suggesting a world beyond is undeniable.不可否认,一切伟大的艺术都具有使人有超尘脱俗的浮想的力量....