New Words：
steam [sti:m]
n.蒸汽；水蒸气；水汽
v.蒸发；散发蒸汽；冒水汽；蒸（食物）
Sample Sentences：
The engines are driven by steam.
Steam has fogged the bathroom mirror.
The steam sang as it escaped from the pipe.
The hot tea steamed my glasses.
Steam is the only way my mom used for cooking crab.
New Words：
marsh [mɑ:ʃ] n. 湿地；沼泽地
marshmallow ['mɑ:ʃmæləu] n. 棉花软糖
Sample Sentences：
It's dangerous to be alone in the marsh.
The marsh was steaming in the strong sun.
He told them that they could eat the marshmallow at once, or wait until he came back and get two marshmallows.
steam [sti:m]
n.蒸汽；水蒸气；水汽
v.蒸发；散发蒸汽；冒水汽；蒸（食物）
New Words：
current ['kʌrənt] n.电流；趋势；水流；气流
Sample Sentences：
The swimmer was swept away by the current.
He swam to the shore against a strong current .
Birds use warm air currents to help their flight.
The current is strongest in the middle of the river.
New Words：
drift [drift] v. 漂移；漂流；飘
Sample Sentences：
Clouds drifted across the sky.
He hasn't decided what to do yet ─ he's just drifting.
The drift wood could have been drifting in the ocean currents for months or even years.
current ['kʌrənt] n.电流；趋势；水流；气流
New Words：
driftwood ['driftwud] n. 浮木；漂流木
Sample Sentences：
After the storm, there was a lot of driftwood washed up on the shore.
I know somebody who built his entire beach house out of other people's "trash" and driftwood . It's a cool house.