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1.sit down 坐下
例句：They sat down by the roadside to take a rest.
他们在路旁坐下休息。
2.up to 多达
例句：I can take up to four people in my car.
我的车能载四人。
3.heart disease 心脏病
例句：It reduces the risks of heart disease.
这降低了患心脏病的风险。
4.cancel out 抵消
例句：He wonders if the different influences might not cancel each other out
他在想，各种影响能不能相互抵消。
