His face was expressionless, but Alex felt the unspoken criticism.他面无表情，但亚历克斯能感觉到他未明言的批评之意。That expressionless face had seemed deep and mysterious.那张毫无表情的脸看上去深沉而又神秘。She sat expressionless, carefully taking notes.她坐在那儿面无表...
Lunar craters can be plainly seen with the aid of a small telescope.借助小型望远镜可以看清月球上的环形山.A series of collapse craters , or calderas, lie at its summit.其顶端有一系列崩塌的火山口, 或称火山臼.Tropical plants, sandy desert, waterfalls, craters...