We were obligated to attend the opening ceremony.我们有必要参加开幕式.Many guests were invited to opening ceremony.许多来宾应邀参加了开幕式.The opening ceremony was a fine spectacle.开幕式典礼是个壮观的场面....
克丽丝悲愤交加，失声痛哭。Chris was weeping in anger and grief.克丽丝特布尔带着公然的敌意看着罗恩。Christabel looked at Ron with open hostility.克丽丝蒂说：“我现在信心十足。”Christie said: "My confidence is sky high."...
The nature of the nutritional requirements for obligate parasites in nature is unknown.人们还不知道自然界中专性寄生菌的营养要求的本质.All the photosynthetic bacteria possess the capability in addition to various facultative aerobes and obligat...