1.break off 折斷
例句:Grace broke off a large piece of the clay.
格雷斯使勁掰掉了一大塊陶土 。
2.physical exam 體檢
例句:Before you conceive, see your health care provider for a physical exam.
在你懷孕以前,讓醫療服務人員為你做一次身體檢查 。
3.at risk 風險
例句:People of all ages are affected, but some groups are more at risk.
各齡年齡組的人都受影響,但有些年齡組的風險更高 。
4.instead of 而不是
例句:Why don't you play football instead of just looking on?
你為什么不參加踢足球而只是看熱鬧?